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Prime
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Available Tasks
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UTC time 2018-01-22 03:48:22 Powered by BOINC


4,130,774 16 CPU   321 Prime Search (LLR) 1002/1000 User Count 343838
4,807,817 16 CPU   Cullen Prime Search (LLR) 751/1000 Host Count 536353
3,363,641 22 CPU   Extended Sierpinski Problem (LLR) 1001/24K Hosts Per User 1.56
2,743,710 31 CPU   Generalized Cullen/Woodall Prime Search (LLR) 749/1000 Tasks in Progress 163167
5,906,962 14 CPU   Prime Sierpinski Problem (LLR) 501/870 Primes Discovered 77481
770,109 575 CPU   Proth Prime Search (LLR) 1497/543K Primes Reported4 at T5K 27333
441,007 2754 CPU   Proth Prime Search Extended (LLR) 1487/638K Mega Primes Discovered 201
1,041,743 213 CPU   Proth Mega Prime Search (LLR) 1490/52K TeraFLOPS 2061.992
7,201,782 12 CPU   Seventeen or Bust (LLR) 764/70K
PrimeGrid's 2018 Challenge Series
Happy New Year Challenge
Jan 1 00:00:00 to Jan 16 00:00:00 (UTC)
Also Feb 1-28: Tour de Primes

Time until Tour de Primes challenge:
Days
Hours
Min
Sec
Standings
Happy New Year Challenge (SoB-LLR): Individuals | Teams
Tour de Primes: Results
1,711,101 62 CPU   Sierpinski / Riesel Base 5 Problem (LLR) 1500/38K
388,342 5K+ CPU   Sophie Germain Prime Search (LLR) 3991/230K
2,702,928 32 CPU   The Riesel Problem (LLR) 1501/2000
5,081,065 16 CPU   Woodall Prime Search (LLR) 500/1000
  CPU   Generalized Cullen/Woodall Prime Search (Sieve) 3999/
  CPU GPU Proth Prime Search (Sieve) 2461/
259,776 5K+ CPU GPU Generalized Fermat Prime Search (n=15) 1990/96K
489,126 2040 CPU GPU Generalized Fermat Prime Search (n=16) 1495/126K
925,307 361 CPU GPU Generalized Fermat Prime Search (n=17 low) 1500/69K
1,007,310 276 CPU GPU Generalized Fermat Prime Search (n=17 mega) 1501/7840
1,727,994 57 CPU GPU Generalized Fermat Prime Search (n=18) 999/14K
3,292,261 22 CPU GPU Generalized Fermat Prime Search (n=19) 999/15K
6,274,498 13 CPU GPU Generalized Fermat Prime Search (n=20) 1003/5860
11,117,203 7 CPU GPU Generalized Fermat Prime Search (n=21) 401/4675
21,169,969 3   GPU Generalized Fermat Prime Search (n=22) 201/2756
  CPU GPU 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 18 January 2018, 19:39:18 UTC, PrimeGrid's Generalized Cullen/Woodall Prime Search found the largest known Generalized Cullen prime:
1323365·1161323365+1
The prime is 2,732,038 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 Scott Brown (Scott Brown) of the United States using an Intel(R) Core(TM) i7-4770S CPU @ 3.10GHz with 4GB RAM, running Windows 10 Enterprise Edition. This computer took about 8 hours and 34 minutes to complete the primality test using multithreaded LLR. Scott is a member of the Aggie The Pew team. For more information, please see the Official Announcement.


On 10 January 2018, 12:26:12 UTC, PrimeGrid's Generalized Fermat Prime Search found the Generalized Fermat mega prime
3853792262144+1
The prime is 1,726,452 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 6th for Generalized Fermat primes and 55th overall.

The discovery was made by Rod Skinner (rjs5) of the United States using an NVIDIA GeForce GTX 1080 in an Intel(R) Core(TM) i7-8700K CPU at 3.70GHz with 16GB RAM, running Linux. This GPU took about 18 minutes to complete the probable prime (PRP) test using GeneferOCL3. Rod is a member of the Intel Corporation team.

The PRP was internally confirmed prime by PrimeGrid using an Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz with 16GB RAM, running Microsoft Windows 10 Professional Edition. This computer took about 6 hours and 59 minutes to complete the primality test using multithreaded LLR. For more information, please see the Official Announcement.


On 28 December 2017, 05:55:36 UTC, PrimeGrid's PPS Mega Prime Search project found the mega prime:
1155·23455254+1
The prime is 1,040,139 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 209th overall.

The discovery was made by Josh Closs (Josh Closs) of the United States using an Intel(R) Core(TM) i5-6400 CPU @ 2.70GHz with 16GB RAM, running Microsoft Windows 10 Core Edition. This computer took about 57 minutes to complete the primality test using LLR. Josh is a member of the Crunch Squad 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

1323365·1161323365+1 (GC): official announcement | Generalized Cullen
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
1880370524288+1 (GFN): official announcement pending | 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
3853792262144+1 (GFN): official announcement | Generalized Fermat Prime
3673932262144+1 (GFN): official announcement | Generalized Fermat Prime
3596074262144+1 (GFN): official announcement | Generalized Fermat Prime
3547726262144+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 | 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

1155·23455254+1 (PPS-Mega): official announcement | Mega Prime
1065·23447906+1 (PPS-Mega): official announcement | Mega Prime
1155·23446253+1 (PPS-Mega): official announcement | Mega Prime
943·23442990+1 (PPS-Mega): official announcement | Mega Prime
943·23440196+1 (PPS-Mega): official announcement | Mega Prime
543·23438810+1 (PPS-Mega): official announcement | Mega Prime
625·23438572+1 (PPS-Mega): official announcement | Mega Prime
1147·23435970+1 (PPS-Mega): official announcement | Mega Prime
911·23432643+1 (PPS-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

168451·219375200+1 (PSP): official announcement | k=168451 eliminated

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

301562·52408646-1 (SR5): official announcement | k=301562 eliminated
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

273809·28932416-1 (TRP): official announcement | k=273809 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

World Record Generalized Cullen Prime!
On 18 January 2018, 19:39:18 UTC, PrimeGrid’s Generalized Cullen/Woodall Prime Search found the largest known Generalized Cullen prime:

1323365*116^1323365+1

Generalized Cullen numbers are of the form: n*b^n+1. Generalized Cullen numbers that are prime are called Generalized Cullen primes. For more information, please see “Cullen prime” in The Prime Glossary (http://primes.utm.edu/glossary/xpage/Cullens.html).

The prime is 2,732,038 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 1st for Generalized Cullen primes and 30th overall.

Base 116 was one of 13 prime-less Generalized Cullen bases below b=121 that PrimeGrid is searching. The remaining bases are 13, 25, 29, 41, 47, 49, 55, 69, 73, 101, 109 & 121.

The discovery was made by Scott Brown (Scott Brown) of the United States using an Intel(R) Core(TM) i7-4770S CPU @ 3.10GHz with 4GB RAM, running Windows 10 Enterprise Edition. This computer took about 8 hours and 34 minutes to complete the primality test using multithreaded LLR. Scott is a member of the Aggie The Pew team.

The prime was verified on 19 January 2018 17:24:17 UTC by Serge De Saffel (lentosy) of Belgium using an Intel(R) Core(TM) i5-6600K CPU @ 3.50GHz with 16GB RAM, running Windows 10 Education Edition. This computer took about 15 hours 22 minutes to complete the primality test using LLR. Serge is a member of the team Sicituradastra.

For more details, please see the official announcement.
20 Jan 2018 | 13:01:34 UTC · Comment


GFN-262144 Mega Prime!
On 10 January 2018, 12:26:12 UTC, PrimeGrid’s Generalized Fermat Prime Search found the Generalized Fermat mega prime:

3853792^262144+1

The prime is 1,726,452 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 6th for Generalized Fermat primes and 55th overall.

The discovery was made by Rod Skinner (rjs5) of the United States using an NVIDIA GeForce GTX 1080 in an Intel(R) Core(TM) i7-8700K CPU at 3.70GHz with 16GB RAM, running Linux. This GPU took about 18 minutes to probable prime (PRP) test with GeneferOCL3. Rod is a member of the Intel Corporation team.

The PRP was confirmed prime by an Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz with 16GB RAM, running Microsoft Windows 10 Professional. This computer took about 6 hours 59 minutes to complete the primality test using LLR.

For more details, please see the official announcement.
12 Jan 2018 | 11:47:22 UTC · Comment


PPS-Mega Prime!
On 28 December 2017, 05:55:36 UTC, PrimeGrid’s PPS Mega Prime Search project found the Mega Prime:
1155*2^3455254+1

The prime is 1,040,139 digits long and will enter Chris Caldwell's The Largest Known Primes Database ranked 209th overall.

The discovery was made by Josh Closs (Josh Closs) of the United States using an Intel(R) Core(TM) i5-6400 CPU @ 2.70GHz with 16GB RAM, running Microsoft Windows 10 Core Edition. This computer took about 57 minutes to complete the primality test using LLR. Josh is a member of the Crunch Squad team.

The prime was verified on 29 December 2017, 12:08:17 UTC by Howard Gordon ([PST]Howard) of the United Kingdom using an AMD Ryzen 7 1800X CPU with 16GB RAM, running Microsoft Windows 10 Core Edition. This computer took about 1 hour 30 minutes to complete the primality test using LLR. Howard is a member of the PrimeSearchTeam team.

For more details, please see the official announcement.
29 Dec 2017 | 13:08:00 UTC · Comment


TRP Mega Prime!
On 13 December 2017, 07:13:55 UTC, PrimeGrid’s The Riesel Problem project eliminated k=273809 by finding the mega prime:

273809*2^8932416-1

The prime is 2,688,931 digits long and will enter Chris Caldwell's The Largest Known Primes Database ranked 29th overall. This is PrimeGrid's 15th elimination. 49 k's now remain.

The discovery was made by Wolfgang Schwieger (DeleteNull) of Germany using an Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz with 32 GB RAM running Linux. This computer took about 2 hours and 14 minutes to complete the primality test using multithreaded LLR. Wolfgang is a member of the SETI.Germany team.

The prime was verified on 15 December 2017, 11:39:55 UTC, by Christian Geffcken (CGe0963) of Switzerland using an Intel(R) Core(TM) i5-3437U CPU @ 1.90GHz with 8 GB RAM running Microsoft Windows 7 Professional. This computer took about 41 hours and 47 minutes to complete the primality test using LLR.

For more details, please see the official announcement.
15 Dec 2017 | 15:03:49 UTC · Comment


Another PPS-Mega Prime!
On 3 December 2017, 20:54:51 UTC, PrimeGrid’s PPS Mega Prime Search project found the Mega Prime:
1065*2^3447906+1

The prime is 1,037,927 digits long and will enter Chris Caldwell's The Largest Known Primes Database ranked 210th overall.

The discovery was made by Juan C. Toledo (Meithan West) of Mexico using an Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz with 8GB RAM, running Linux. This computer took about 1 hour 48 minutes to complete the primality test using LLR. Juan is a member of the UNAM – Universidad Nacional Autonoma de Mexico team.

The prime was verified on 3 December 2017, 22:23:34 UTC by Lucas Brown (LucasBrown) of the United States using an Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz with 64GB RAM, running Linux. This computer took about 48 minutes to complete the primality test using LLR. Lucas is a member of the XKCD team.

For more details, please see the official announcement.
5 Dec 2017 | 14:27:54 UTC · Comment


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Newly reported primes

84607726^32768+1 (DaveSun); 3870313125945*2^1290000-1 (Randall J. Scalise); 29048042^65536+1 (Honza); 571*2^3460216+1 (Randall J. Scalise); 2021*2^1464837+1 (Sashixi); 1323365*116^1323365+1 (Scott Brown); 48370248^131072+1 (Gilbert Kalus); 3866364144375*2^1290000-1 (288larsson); 84238684^32768+1 (teppot); 84100142^32768+1 (DaveSun); 84034616^32768+1 (teppot); 83955848^32768+1 (DaveSun); 3856362958695*2^1290000-1 (lutz_e); 6839*2^1464507+1 (Medijate); 3859801326507*2^1290000-1 (Kai Ylijoki); 3857811583257*2^1290000-1 (Randall J. Scalise); 3495*2^1464343+1 (some-one); 3858671135805*2^1290000-1 (eXaPower); 83551588^32768+1 (Fudge); 3853792^262144+1 (rjs5)

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