PrimeGrid
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Prime
Rank1

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Available
Tasks A2 / B3
UTC time 2017-09-23 10:54:33 Powered by BOINC


14 321 Prime Search (LLR) 1001/1000 User Count 341593
14 Cullen Prime Search (LLR) 751/1000 Host Count 529808
21 Extended Sierpinski Problem (LLR) 1001/5327 Hosts Per User 1.55
30 Generalized Cullen/Woodall Prime Search (LLR) 1001/1000 Tasks in Progress 139544
13 Prime Sierpinski Problem (LLR) 401/1344 Primes Discovered 77019
541 Proth Prime Search (LLR) 1494/991K Primes Reported4 at T5K 27176
2636 Proth Prime Search Extended (LLR) 3994/272K Mega Primes Discovered 181
206 Proth Mega Prime Search (LLR) 1494/33K TeraFLOPS 1268.944
7 Seventeen or Bust (LLR) 749/118K
PrimeGrid's 2017 Challenge Series
Number Theory Week Challenge
Sep 3 18:00:00 to Sep 8 18:00:00 (UTC)


Time until Diwali/Deepavali challenge:
Days
Hours
Min
Sec
Standings
Number Theory Week Challenge (321-LLR): Individuals | Teams
56 Sierpinski / Riesel Base 5 Problem (LLR) 1501/65K
5K+ Sophie Germain Prime Search (LLR) 3957/508K
29 The Riesel Problem (LLR) 1501/2000
14 Woodall Prime Search (LLR) 751/1000
  Generalized Cullen/Woodall Prime Search (Sieve) 1487/
  Proth Prime Search (Sieve) 2478/
5K+ Generalized Fermat Prime Search (n=15) 1486/139K
1969 Generalized Fermat Prime Search (n=16) 1497/175K
344 Generalized Fermat Prime Search (n=17 low) 1501/20K
254 Generalized Fermat Prime Search (n=17 mega) 1501/34K
52 Generalized Fermat Prime Search (n=18) 999/31K
21 Generalized Fermat Prime Search (n=19) 999/13K
12 Generalized Fermat Prime Search (n=20) 1002/3878
6 Generalized Fermat Prime Search (n=21) 402/2594
2 Generalized Fermat Prime Search (n=22) 201/574
  AP27 Search 1501/

1"Prime Rank" is where the leading edge candidate, if prime, would appear in the Top 5000 Primes list. "5K+" means the primes are too small to make the list.
2First "Available Tasks" number (A) is the number of tasks immediately available to send.
3Second "Available Tasks" number (B) is additional prime candidates that have not yet been turned into workunits. Underlined work is loaded manually. If the first number (A) is 0, something is broken. If both numbers are 0, we've run out of work. Two tasks (A) are generated automatically from each prime candidate (B) when needed, so the total number of tasks available without manual intervention is A+2*B. If the B number is not underlined, new candidates (B) are also automatically created from sieve files, which typically contain millions of candidates. If B is infinite (∞), there's essentially an unlimited amount of work available.
4Includes all primes ever reported by PrimeGrid to Top 5000 Primes list. Many of these are no longer in the top 5000.

About

Primegrid's primary goal is to advance mathematics by enabling everyday computer users to contribute their system's processing power towards prime finding. By simply downloading and installing BOINC and attaching to the PrimeGrid project, participants can choose from a variety of prime forms to search. With a little patience, you may find a large or even record breaking prime and enter into Chris Caldwell's The Largest Known Primes Database as a Titan!

PrimeGrid's secondary goal is to provide relevant educational materials about primes. Additionally, we wish to contribute to the field of mathematics.

Lastly, primes play a central role in the cryptographic systems which are used for computer security. Through the study of prime numbers it can be shown how much processing is required to crack an encryption code and thus to determine whether current security schemes are sufficiently secure.

PrimeGrid is currently running several sub-projects:
  • 321 Prime Search: searching for mega primes of the form 3·2n±1.
  • Cullen-Woodall Search: searching for mega primes of forms n·2n+1 and n·2n−1.
  • Extended Sierpinski Problem: helping solve the Extended Sierpinski Problem.
  • Generalized Fermat Prime Search: searching for megaprimes of the form b2n+1.
  • Prime Sierpinski Project: helping Prime Sierpinski Project solve the Prime Sierpinski Problem.
  • Proth Prime Search: searching for primes of the form k·2n+1.
  • Seventeen or Bust: helping to solve the Sierpinski Problem.
  • Sierpinski/Riesel Base 5: helping to solve the Sierpinski/Riesel Base 5 Problem.
  • Sophie Germain Prime Search: searching for primes p and 2p+1.
  • The Riesel problem: helping to solve the Riesel Problem.
   You can choose the projects you would like to run by going to the project preferences page.

Recent Significant Primes


On 15 September 2017, 11:01:15 UTC, PrimeGrid's PPS Mega Prime Search project found the mega prime:
1127·23427219+1
The prime is 1,031,699 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 203rd overall.

The discovery was made by Randall Scalise (Randall J. Scalise) of the United States using an Intel(R) Core(TM) i5-4590 CPU @ 3.30GHz with 6 GB RAM, running Linux. This computer took about 1 hour and 13 minutes to complete the primality test using LLR. For more information, please see the Official Announcement.


On 5 September 2017, 08:23:41 UTC, PrimeGrid's AP27 Search (Arithmetic Progression of 27 primes) found the progression of 26 primes:
48277590120607451+37835074*23#*n for n=0..25
It is the 7th known AP26 known to exist, and the fourth found at PrimeGrid.

The discovery was made by Bruce E. Slade (Renix1943) of the United States using an NVIDIA GTX 970 GPU in an Intel(R) Core(TM) i3-6100 @ 3.70GHz CPU with 16GB RAM, running Microsoft Windows 10 Core Edition. This GPU took about 41 minutes to process the task (each task tests 100 progression differences of 10 shifts each). Bruce is a member of the Aggie The Pew team. For more information, please see the Official Announcement.


On 29 August 2017, 14:15:23 UTC, PrimeGrid's Generalized Fermat Prime Search found the Generalized Fermat mega prime:
9194441048576+1
The prime is 6,253,210 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 1st for Generalized Fermat Primes and 12th overall. This is the first Generalized Fermat prime found for n=20, the second-largest prime found by PrimeGrid, and the second-largest known non-Mersenne prime.

The discovery was made by Sylvanus A. Zimmerman (Van Zimmerman) of the United States using an Nvidia GeForce GTX 1060 in an Intel(R) Xeon(R) E3-1225 v3 CPU at 3.20GHz with 8GB RAM, running Microsoft Windows 10 Professional Edition. This GPU took about 4 hours and 43 minutes to complete the probable prime (PRP) test using GeneferOCL4. Sylvanis is a member of the Aggie The Pew team. For more information, please see the Official Announcement.


On 30 August 2017, 13:17:35 UTC, PrimeGrid's Generalized Fermat Prime Search found the Generalized Fermat mega prime:
47090246131072+1
The prime is 1,005,707 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 24th for Generalized Fermat Primes and 247th overall.

The discovery was made by Roman Voskoboynikov (rvoskoboynikov) of the United States using an Nvidia GeForce GTX 1050 Ti in an Intel(R) Core(TM) i5-4670 CPU at 3.40GHz with 16GB RAM, running Microsoft Windows 10 Professional Edition. This GPU took about 16 minutes to complete the probable prime (PRP) test using GeneferOCL2. For more information, please see the Official Announcement.


On 25 August 2017, 04:39:57 UTC, PrimeGrid's Sierpinski/Riesel Base 5 Problem project eliminated k=171362 by finding the mega prime:
171362·52400996-1
The prime is 1,678,230 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 57th overall. 73 k's now remain in the Riesel Base 5 Problem.

The discovery was made by Frank Schwegler (Frank Schwegler) of the United States using an Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz with 16GB RAM running Microsoft Windows 7 Ultimate Edition. This computer took about 40 hours and 12 minutes to complete the primality test using LLR. For more information, please see the Official Announcement.


On 24 August 2017, 11:36:16 UTC, PrimeGrid's PPS Mega Prime Search project found the mega prime:
1119·23422189+1
The prime is 1,030,185 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 200th overall.

The discovery was made by Jochen Beck (dh1saj) of Germany using an Intel(R) Core(TM) i5-4670 CPU @ 3.40GHz with 8GB RAM, running Microsoft Windows 7 Professional Edition. This computer took about 1 hours and 19 minutes to complete the primality test using LLR. Jochen is a member of the SETI.Germany team. For more information, please see the Official Announcement.


On 21 August 2017, 14:51:43 UTC, PrimeGrid's Generalized Cullen/Woodall Prime Search project found the largest known generalized Cullen prime:
1341174·531341174+1
The prime is 2,312,561 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 1st for generalized Cullen primes and 30th overall.

The discovery was made by Hiroyuki Okazaki (zunewantan) of Japan using an Intel(R) CPU @ 2.90GHz with 16GB RAM, running Linux. This computer took about 12 hours and 39 minutes to complete the primality test using multithreaded LLR. Hiroyuki is a member of the Aggie The Pew team. For more information, please see the Official Announcement.


On 18 August 2017, 19:28:05 UTC, PrimeGrid's PPS Mega Prime Search project found the mega prime:
1005·23420846+1
The prime is 1,029,781 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 199th overall.

The discovery was made by Łukasz Piotrowski (stiven) of Poland using an Intel(R) Xeon(R) E3-1220 v3 CPU @ 3.10GHz with 4GB RAM, running Linux. This computer took about 1 hours and 1 minute to complete the primality test using LLR. Łukasz is a member of the BOINC@Poland team. For more information, please see the Official Announcement.


Other significant primes


3·211895718-1 (321): official announcement | 321
3·211731850-1 (321): official announcement | 321
3·211484018-1 (321): official announcement | 321
3·210829346+1 (321): official announcement | 321
3·27033641+1 (321): official announcement | 321
3·26090515-1 (321): official announcement | 321
3·25082306+1 (321): official announcement | 321
3·24235414-1 (321): official announcement | 321
3·22291610+1 (321): official announcement | 321

27·25213635+1 (27121): official announcement | 27121
27·24583717-1 (27121): official announcement | 27121
27·24542344-1 (27121): official announcement | 27121
121·24553899-1 (27121): official announcement | 27121
27·23855094-1 (27121): official announcement | 27121

48277590120607451+37835074*23#*n for n=0..25 (AP26): official announcement
142099325379199423+16549135*23#*n for n=0..25 (AP26): official announcement
149836681069944461+7725290*23#*n for n=0..25 (AP26): official announcement
43142746595714191+23681770*23#*n for n=0..25 (AP26): official announcement

6679881·26679881+1 (CUL): official announcement | Cullen
6328548·26328548+1 (CUL): official announcement | Cullen

161041·27107964+1 (ESP): official announcement | k=161041 eliminated

147855!-1 (FPS): official announcement | Factorial
110059!+1 (FPS): official announcement | Factorial
103040!-1 (FPS): official announcement | Factorial
94550!-1 (FPS): official announcement | Factorial

1341174·531341174+1 (GC): official announcement | Generalized Cullen
682156·79682156+1 (GC): official announcement | Generalized Cullen
427194·113427194+1 (GC): official announcement | Generalized Cullen

9194441048576+1 (GFN): official announcement | Generalized Fermat Prime
475856524288+1 (GFN): official announcement | Generalized Fermat Prime
356926524288+1 (GFN): official announcement | Generalized Fermat Prime
341112524288+1 (GFN): official announcement | Generalized Fermat Prime
75898524288+1 (GFN): official announcement | Generalized Fermat Prime
3060772262144+1 (GFN): official announcement | Generalized Fermat Prime
2676404262144+1 (GFN): official announcement | Generalized Fermat Prime
2611204262144+1 (GFN): official announcement | Generalized Fermat Prime
2514168262144+1 (GFN): official announcement | Generalized Fermat Prime
2042774262144+1 (GFN): official announcement | Generalized Fermat Prime
1828858262144+1 (GFN): official announcement | Generalized Fermat Prime
1615588262144+1 (GFN): official announcement | Generalized Fermat Prime
1488256262144+1 (GFN): official announcement | Generalized Fermat Prime
1415198262144+1 (GFN): official announcement | Generalized Fermat Prime
773620262144+1 (GFN): official announcement | Generalized Fermat Prime
676754262144+1 (GFN): official announcement | Generalized Fermat Prime
525094262144+1 (GFN): official announcement | Generalized Fermat Prime
361658262144+1 (GFN): official announcement | Generalized Fermat Prime
145310262144+1 (GFN): official announcement | Generalized Fermat Prime
40734262144+1 (GFN): official announcement | Generalized Fermat Prime
47179704131072+1 (GFN): official announcement pending | Generalized Fermat Prime
47090246131072+1 (GFN): official announcement | Generalized Fermat Prime
46776558131072+1 (GFN): official announcement | Generalized Fermat Prime
46736070131072+1 (GFN): official announcement | Generalized Fermat Prime
46730280131072+1 (GFN): official announcement | Generalized Fermat Prime
46413358131072+1 (GFN): official announcement | Generalized Fermat Prime
46385310131072+1 (GFN): official announcement | Generalized Fermat Prime
46371508131072+1 (GFN): official announcement | Generalized Fermat Prime
46077492131072+1 (GFN): official announcement | Generalized Fermat Prime
45570624131072+1 (GFN): official announcement | Generalized Fermat Prime
45315256131072+1 (GFN): official announcement | Generalized Fermat Prime
44919410131072+1 (GFN): official announcement | Generalized Fermat Prime
44438760131072+1 (GFN): official announcement | Generalized Fermat Prime
44330870131072+1 (GFN): official announcement | Generalized Fermat Prime
44085096131072+1 (GFN): official announcement | Generalized Fermat Prime
44049878131072+1 (GFN): official announcement | Generalized Fermat Prime
43165206131072+1 (GFN): official announcement | Generalized Fermat Prime
43163894131072+1 (GFN): official announcement | Generalized Fermat Prime
42654182131072+1 (GFN): official announcement | Generalized Fermat Prime

563528·13563528-1 (GW): official announcement | Generalized Woodall
404882·43404882-1 (GW): official announcement | Generalized Woodall

1098133#-1 (PRS): official announcement | Primorial
843301#-1 (PRS): official announcement | Primorial

373·23404702+1 (MEGA): official announcement | Mega Prime
303·23391977+1 (MEGA): official announcement | Mega Prime
369·23365614+1 (MEGA): official announcement | Mega Prime
393·23349525+1 (MEGA): official announcement | Mega Prime
113·23437145+1 (MEGA): official announcement | Mega Prime
159·23425766+1 (MEGA): official announcement | Mega Prime
245·23411973+1 (MEGA): official announcement | Mega Prime
177·23411847+1 (MEGA): official announcement | Mega Prime
35·23587843+1 (MEGA): official announcement | Mega Prime
35·23570777+1 (MEGA): official announcement | Mega Prime
33·23570132+1 (MEGA): official announcement | Mega Prime
93·23544744+1 (MEGA): official announcement | Mega Prime
87·23496188+1 (MEGA): official announcement | Mega Prime
51·23490971+1 (MEGA): official announcement | Mega Prime
81·23352924+1 (MEGA): official announcement | Mega Prime

1127·23427219+1 (PPS-Mega): official announcement | Mega Prime
1119·23422189+1 (PPS-Mega): official announcement | Mega Prime
1005·23420846+1 (PPS-Mega): official announcement | Mega Prime
975·23419230+1 (PPS-Mega): official announcement | Mega Prime
999·23418885+1 (PPS-Mega): official announcement | Mega Prime
907·23417890+1 (PPS-Mega): official announcement | Mega Prime
953·23405729+1 (PPS-Mega): official announcement | Mega Prime
833·23403765+1 (PPS-Mega): official announcement | Mega Prime
1167·23399748+1 (PPS-Mega): official announcement | Mega Prime
611·23398273+1 (PPS-Mega): official announcement | Mega Prime
609·23392301+1 (PPS-Mega): official announcement | Mega Prime
1049·23395647+1 (PPS-Mega): official announcement | Mega Prime
555·23393389+1 (PPS-Mega): official announcement | Mega Prime
805·23391818+1 (PPS-Mega): official announcement | Mega Prime
663·23390469+1 (PPS-Mega): official announcement | Mega Prime
621·23378148+1 (PPS-Mega): official announcement | Mega Prime
1093·23378000+1 (PPS-Mega): official announcement | Mega Prime
861·23377601+1 (PPS-Mega): official announcement | Mega Prime
677·23369115+1 (PPS-Mega): official announcement | Mega Prime
715·23368210+1 (PPS-Mega): official announcement | Mega Prime
617·23368119+1 (PPS-Mega): official announcement | Mega Prime
777·23367372+1 (PPS-Mega): official announcement | Mega Prime
533·23362857+1 (PPS-Mega): official announcement | Mega Prime
619·23362814+1 (PPS-Mega): official announcement | Mega Prime
1183·23353058+1 (PPS-Mega): official announcement | Mega Prime
543·23351686+1 (PPS-Mega): official announcement | Mega Prime
733·23340464+1 (PPS-Mega): official announcement | Mega Prime
651·23337101+1 (PPS-Mega): official announcement | Mega Prime
849·23335669+1 (PPS-Mega): official announcement | Mega Prime
611·23334875+1 (PPS-Mega): official announcement | Mega Prime
673·23330436+1 (PPS-Mega): official announcement | Mega Prime
655·23327518+1 (PPS-Mega): official announcement | Mega Prime
659·23327371+1 (PPS-Mega): official announcement | Mega Prime
821·23327003+1 (PPS-Mega): official announcement | Mega Prime
555·23325925+1 (PPS-Mega): official announcement | Mega Prime
791·23323995+1 (PPS-Mega): official announcement | Mega Prime
597·23322871+1 (PPS-Mega): official announcement | Mega Prime
415·23559614+1 (PPS-Mega): official announcement | Mega Prime
465·23536871+1 (PPS-Mega): official announcement | Mega Prime
447·23533656+1 (PPS-Mega): official announcement | Mega Prime
495·23484656+1 (PPS-Mega): official announcement | Mega Prime
491·23473837+1 (PPS-Mega): official announcement | Mega Prime
453·23461688+1 (PPS-Mega): official announcement | Mega Prime
479·23411975+1 (PPS-Mega): official announcement | Mega Prime
453·23387048+1 (PPS-Mega): official announcement | Mega Prime
403·23334410+1 (PPS-Mega): official announcement | Mega Prime
309·23577339+1 (PPS-Mega): official announcement | Mega Prime
381·23563676+1 (PPS-Mega): official announcement | Mega Prime
351·23545752+1 (PPS-Mega): official announcement | Mega Prime
345·23532957+1 (PPS-Mega): official announcement | Mega Prime
329·23518451+1 (PPS-Mega): official announcement | Mega Prime
323·23482789+1 (PPS-Mega): official announcement | Mega Prime
189·23596375+1 (PPS-Mega): official announcement | Mega Prime
387·23322763+1 (PPS-Mega): official announcement | Mega Prime
275·23585539+1 (PPS-Mega): official announcement | Mega Prime
251·23574535+1 (PPS-Mega): official announcement | Mega Prime
191·23548117+1 (PPS-Mega): official announcement | Mega Prime
141·23529287+1 (PPS-Mega): official announcement | Mega Prime
135·23518338+1 (PPS-Mega): official announcement | Mega Prime
249·23486411+1 (PPS-Mega): official announcement | Mega Prime
195·23486379+1 (PPS-Mega): official announcement | Mega Prime
197·23477399+1 (PPS-Mega): official announcement | Mega Prime
255·23395661+1 (PPS-Mega): official announcement | Mega Prime
179·23371145+1 (PPS-Mega): official announcement | Mega Prime
193·23329782+1 (PPS-Mega): official announcement | Fermat Divisor
129·23328805+1 (PPS-Mega): official announcement | Mega Prime

7·25775996+1 (PPS): official announcement | Mega Prime
9·23497442+1 (PPS): official announcement | Mega Prime
57·22747499+1 (PPS): official announcement | Fermat Divisor
267·22662090+1 (PPS): official announcement | Fermat Divisor
9·22543551+1 (PPS): official announcement | Fermat Divisor
25·22141884+1 (PPS): official announcement | Fermat Divisor
183·21747660+1 (PPS): official announcement | Fermat Divisor
131·21494099+1 (PPS): official announcement | Fermat Divisor
329·21246017+1 (PPS): official announcement | Fermat Divisor
2145·21099064+1 (PPS): official announcement | Fermat Divisor
1705·2906110+1 (PPS): official announcement | Fermat Divisor
659·2617815+1 (PPS): official announcement | Fermat Divisor
519·2567235+1 (PPS): official announcement | Fermat Divisor
651·2476632+1 (PPS): official announcement | Fermat Divisor
7905·2352281+1 (PPS): official announcement | Fermat Divisor
4479·2226618+1 (PPS): official announcement | Fermat Divisor
3771·2221676+1 (PPS): official announcement | Fermat Divisor
7333·2138560+1 (PPS): official announcement | Fermat Divisor

10223·231172165+1 (SoB): official announcement | k=10223 eliminated

2996863034895·21290000±1 (SGS): official announcement | Twin
2618163402417·21290000-1 (SGS), 2618163402417·21290001-1 (2p+1): official announcement | SGS
18543637900515·2666667-1 (SGS), 18543637900515·2666668-1 (2p+1): official announcement | SGS
3756801695685·2666669±1 (SGS): official announcement | Twin

171362·52400996-1 (SR5): official announcement | k=171362 eliminated
180062·52249192-1 (SR5): official announcement | k=180062 eliminated
53546·52216664-1 (SR5): official announcement | k=53546 eliminated
296024·52185270-1 (SR5): official announcement | k=296024 eliminated
92158·52145024+1 (SR5): official announcement | k=92158 eliminated
77072·52139921+1 (SR5): official announcement | k=77072 eliminated
306398·52112410-1 (SR5): official announcement | k=306398 eliminated
154222·52091432+1 (SR5): official announcement | k=154222 eliminated
100186·52079747-1 (SR5): official announcement | k=100186 eliminated
144052·52018290+1 (SR5): official announcement | k=144052 eliminated
109208·51816285+1 (SR5): official announcement | k=109208 eliminated
325918·51803339+1 (SR5): official announcement | k=325918 eliminated
133778·51785689+1 (SR5): official announcement | k=133778 eliminated
24032·51768249+1 (SR5): official announcement | k=24032 eliminated
138172·51714207-1 (SR5): official announcement | k=138172 eliminated
22478·51675150-1 (SR5): official announcement | k=22478 eliminated
326834·51634978-1 (SR5): official announcement | k=326834 eliminated
207394·51612573-1 (SR5): official announcement | k=207394 eliminated
104944·51610735-1 (SR5): official announcement | k=104944 eliminated
330286·51584399-1 (SR5): official announcement | k=330286 eliminated
22934·51536762-1 (SR5): official announcement | k=22934 eliminated
178658·51525224-1 (SR5): official announcement | k=178658 eliminated
59912·51500861+1 (SR5): official announcement | k=59912 eliminated
37292·51487989+1 (SR5): official announcement | k=37292 eliminated
173198·51457792-1 (SR5): official announcement | k=173198 eliminated

502573·27181987-1 (TRP): official announcement | k=502573 eliminated
402539·27173024-1 (TRP): official announcement | k=402539 eliminated
40597·26808509-1 (TRP): official announcement | k=40597 eliminated
304207·26643565-1 (TRP): official announcement | k=304207 eliminated
398023·26418059-1 (TRP): official announcement | k=398023 eliminated
252191·25497878-1 (TRP): official announcement | k=252191 eliminated
353159·24331116-1 (TRP): official announcement | k=353159 eliminated
141941·24299438-1 (TRP): official announcement | k=141941 eliminated
415267·23771929-1 (TRP): official announcement | k=415267 eliminated
123547·23804809-1 (TRP): official announcement | k=123547 eliminated
65531·23629342-1 (TRP): official announcement | k=65531 eliminated
428639·23506452-1 (TRP): official announcement | k=428639 eliminated
191249·23417696-1 (TRP): official announcement | k=191249 eliminated
162941·2993718-1 (TRP): official announcement | k=162941 eliminated

65516468355·2333333±1 (TPS): official announcement | Twin

3752948·23752948-1 (WOO): official announcement | Woodall
2367906·22367906-1 (WOO): official announcement | Woodall
2013992·22013992-1 (WOO): official announcement | Woodall

News RSS feed

PRPNet September Challenge
Factorial Equinox Challenge

The equinoxes are the only times when the solar terminator (the "edge" between night and day) is perpendicular to the equator. As a result, the northern and southern hemispheres are equally illuminated. The Latinate names vernal equinox (spring) and autumnal equinox (fall) are often used. To celebrate we're running a PRPNet challenge at the FPS (factorial prime search) from 22nd 12:00 UTC until 27th of September 12:00 UTC.
To take part, you have to activate the following line in prpclient.ini:

server=FPS:100:1:prpnet.primegrid.com:12002

Stats will be available at the well known place here.
All previous PRPNet challenge stats can be found here.
Discussion and more information can be found here: 2017 PRPNet September Challenge.

Good luck! 22 Sep 2017 | 13:12:15 UTC · Comment

Another PPS-Mega Prime!
On 15 September 2017, 11:01:15 UTC, PrimeGrid’s PPS Mega Prime Search project found the Mega Prime:
1127*2^3427219+1

The prime is 1,031,699 digits long and will enter Chris Caldwell's The Largest Known Primes Database ranked 203rd overall.

The discovery was made by Randall Scalise (Randall J. Scalise) of the United States using an Intel(R) Core(TM) i5-4590 CPU @ 3.30GHz with 6GB RAM, running Linux. This computer took about 1 hour 13 minutes to complete the primality test using LLR.

The prime was verified on 15 September 2017, 22:09:16 UTC by Hans-Jürgen Bergelt (Hans-Jürgen Bergelt) of Germany using an Intel(R) Core(TM) i7-3960X CPU @ 3.30GHz with 8GB RAM, running Microsoft Windows 7. This computer took about 1 hour 49 minutes to complete the primality test using LLR. Hans-Jürgen is a member of the SETI.Germany team.

For more details, please see the official announcement.
16 Sep 2017 | 10:23:50 UTC · Comment


We Need Your Help!
In the past, donations were nice to have, but not critical to our operation. As you likely already know, RackSpace is ending our free hosting. While all of the PrimeGrid admins volunteer their effort, equipment, and electricity, as do all of its members, PrimeGrid needs to find and afford a home.

In choosing a path forward, we have considered both current and ongoing costs, as well as maintaining quality of service at the levels to which we've become accustomed. In doing so, the best option for PrimeGrid is to purchase servers and house them at a paid colocation service.

Moving forward, PrimeGrid needs to cover the 3,500 euro cost of the initial hardware purchase, and then needs to start covering the costs of colocation. Ultimately, we will need to plan for hardware lifecycle as well. We are quite appreciative of the donations we have received towards this effort, and you can see our progress here: https://www.primegrid.com/donations.php where it quickly becomes evident that we still have a ways to go.

Your contributions are greatly appreciated and will help keep PrimeGrid strong and viable in the years ahead. We have done a lot of great work here, and hope to ensure its continued success.
15 Sep 2017 | 20:40:28 UTC · Comment


AP26 Found!
On 5 September 2017, 08:23:41 UTC, PrimeGrid’s AP27 Search (Arithmetic Progression of 27 primes) found the progression of 26 primes:

48277590120607451+37835074*23#*n for n=0..25

It is the 7th known AP26 known to exist, and the fourth found at PrimeGrid.

The discovery was made by Bruce E. Slade (Renix1943) of the United States using a NVIDIA GTX 970 GPU in an Intel(R) Core(TM) i3-6100 @ 3.70GHz CPU with 16GB RAM, running Microsoft Windows 10 Core Edition. This computer took about 41 minutes to process the task (each task tests 100 progression differences of 10 shifts each). Bruce is a member of the Aggie The Pew team.

The progression was verified on 5 September 2017 19:34:24 UTC, by Axel Schneider (axels) of Germany using an NVIDIA GTX 680 GPU on an Intel(R) Core(TM)2 Quad Q9400 CPU @ 2.66GHz with 8GB RAM running Microsoft Windows 7 Home Premium Edition. This computer took about 2 hours 6 minutes to process the task. Axel is a member of the SETI.Germany team.

For more details, please see the official announcement.
7 Sep 2017 | 16:51:26 UTC · Comment


GFN-1048576 Mega Prime!
On 29 August 2017, 14:15:23 UTC, PrimeGrid’s Generalized Fermat Prime Search found the Generalized Fermat mega prime:

919444^1048576+1

The prime is 6,253,210 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 1st for Generalized Fermat primes and 12th overall. This is the first Generalized Fermat prime found for n=20, the second-largest prime found by PrimeGrid, and the second-largest non-Mersenne prime.

The discovery was made by Sylvanus A. Zimmerman (Van Zimmerman) of the United States using a Nvidia GeForce GTX 1060 in an Intel(R) Xeon(R) E3-1225 v3 CPU at 3.20GHz with 8GB RAM, running Microsoft Windows 10 Professional Edition. This GPU took about 4 hours 43 minutes to probable prime (PRP) test with GeneferOCL4. Sylvanus is a member of the Aggie The Pew team.

Double-checker information will be announced once available.

The PRP was confirmed prime by an Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz with 16GB RAM, running Microsoft Windows 10 Professional Edition. This computer took about 3 days, 23 hours, 53 minutes to complete the primality test using multithreaded LLR.

For more details, please see the official announcement.
2 Sep 2017 | 17:03:28 UTC · Comment


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Newly reported primes

2375*2^1457811+1 (composite); 9195*2^1457794+1 (ext2097); 3727652988237*2^1290000-1 (usverg); 3725634193125*2^1290000-1 (RussellBest); 5407*2^1457678+1 (RGB); 59909644^32768+1 ([BOINC@Poland]mimeq); 59850740^32768+1 (NUCCpod_NAPTIMELABS_01); 59858148^32768+1 (TONYHongKong); 3720815370627*2^1290000-1 (KWSN-SpongeBob SquarePants); 3720800327307*2^1290000-1 (KWSN-SpongeBob SquarePants); 3721745642685*2^1290000-1 (TeeVeeEss); 3720255807765*2^1290000-1 (neuralstatic); 3720299748165*2^1290000-1 (Krzysiak_PL_GDA); 3722645982195*2^1290000-1 (mclknight); 3722496953565*2^1290000-1 (Randall J. Scalise); 8721*2^1457528+1 (Randall J. Scalise); 8565*2^1457449+1 (Charles Jackson); 3723571452645*2^1290000-1 (TeeVeeEss); 3723164887647*2^1290000-1 (pons66); 3719462989305*2^1290000-1 (E. T. Drumm)

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