PrimeGrid
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Prime
Rank1

Sub-Project
Available
Tasks A2 / B3
UTC time 2017-10-20 12:27:16 Powered by BOINC


15 321 Prime Search (LLR) 1001/999 User Count 341893
15 Cullen Prime Search (LLR) 751/1000 Host Count 531223
21 Extended Sierpinski Problem (LLR) 1000/3228 Hosts Per User 1.55
31 Generalized Cullen/Woodall Prime Search (LLR) 751/1000 Tasks in Progress 153814
13 Prime Sierpinski Problem (LLR) 400/680 Primes Discovered 77118
544 Proth Prime Search (LLR) 1501/885K Primes Reported4 at T5K 27209
2649 Proth Prime Search Extended (LLR) 1498/1261K Mega Primes Discovered 185
208 Proth Mega Prime Search (LLR) 1500/288K TeraFLOPS 1478.698
7 Seventeen or Bust (LLR) 750/112K
PrimeGrid's 2017 Challenge Series
Diwali/Deepavali Challenge
Oct 18 00:00:00 to Oct 23 00:00:00 (UTC)


Time until end of Diwali/Deepavali challenge:
Days
Hours
Min
Sec
Standings
Diwali/Deepavali Challenge (TRP-LLR): Individuals | Teams
56 Sierpinski / Riesel Base 5 Problem (LLR) 1503/60K
5K+ Sophie Germain Prime Search (LLR) 3997/811K
30 The Riesel Problem (LLR) 1499/8472
15 Woodall Prime Search (LLR) 750/1000
  Generalized Cullen/Woodall Prime Search (Sieve) 3981/
  Proth Prime Search (Sieve) 2477/
5K+ Generalized Fermat Prime Search (n=15) 1494/166K
1977 Generalized Fermat Prime Search (n=16) 1528/101K
348 Generalized Fermat Prime Search (n=17 low) 1558/134K
258 Generalized Fermat Prime Search (n=17 mega) 1501/5661
53 Generalized Fermat Prime Search (n=18) 1001/15K
21 Generalized Fermat Prime Search (n=19) 1001/6045
12 Generalized Fermat Prime Search (n=20) 1003/2604
6 Generalized Fermat Prime Search (n=21) 401/1076
2 Generalized Fermat Prime Search (n=22) 201/4296
  AP27 Search 1502/

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 17 October 2017, 13:48:48 UTC, PrimeGrid's PPS Mega Prime Search project found the mega prime:
1147·23435970+1
The prime is 1,034,334 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 208th 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 8GB RAM, running Linux. This computer took about 1 hour and 6 minutes to complete the primality test using LLR. For more information, please see the Official Announcement.


On 5 October 2017, 08:47:45 UTC, PrimeGrid's PPS Mega Prime Search project found the mega prime:
911·23432643+1
The prime is 1,033,331 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 208th 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 Windows 7 Professional Edition. This computer took about 1 hour and 25 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 17 September 2017, 21:30:08 UTC, PrimeGrid's Prime Sierpinski Problem project eliminated k=168451 by finding the mega prime:
168451·219375200+1
The prime is 5,832,522 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 13th overall. 9 k's now remain in the Prime Sierpinski Problem (2 of which are being searched as part of Seventeen or Bust). This is the third largest prime found by PrimeGrid.

Until the Prime Sierpinski Project shut down in 2014, this search was a collaboration between Primegrid and the Prime Sierpinski Project. This discovery would not have been possible without all the work done over the years by the Prime Sierpinski Project.

The discovery was made by Ben Maloney (paleseptember) of Australia using an Intel(R) Core(TM) i5-6400 CPU @ 2.70GHz with 16GB RAM running Windows 10 Professional Edition. This computer took about 2 days, 15 hours and 11 minutes to complete the primality test using LLR. Ben is a member of the Free-DC team. For more information, please see the Official Announcement.


On 17 August 2017, 20:18:24 UTC, PrimeGrid's Sierpinski/Riesel Base 5 Problem project eliminated k=301562 by finding the mega prime:
301562·52408646-1
The prime is 1,683,577 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 57th overall. 72 k's now remain in the Riesel Base 5 Problem.

The discovery was made by Håkan Lind (sangis43) of Sweden using an Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz with 32 GB RAM running Microsoft Windows 7 Professional Edition. This computer took about 43 hours and 57 minutes to complete the primality test using LLR. Håkan is a member of the Sicituradastra. team. For more information, please see the Official Announcement.


On 14 September 2017, 23:21:35 UTC, PrimeGrid's Generalized Fermat Prime Search found the Generalized Fermat mega prime:
47179704131072+1
The prime is 1,005,815 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 26th for Generalized Fermat Primes and 250th overall.

The discovery was made by Andrei Okhrimouk (AndreiO) of Australia using an NVIDIA Geforce GTX 960 series GPU in an Intel(R) Core(TM)2 Dup CPU at 2.80GHz with 4GB RAM, running Microsoft Windows 10 Professional Edition. This GPU took about 21 minutes to complete the probable prime (PRP) test using GeneferOCL2. 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 | 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

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

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

Another PPS-Mega Prime!
On 17 October 2017, 13:48:48 UTC, PrimeGrid’s PPS Mega Prime Search project found the Mega Prime:
1147*2^3435970+1

The prime is 1,034,334 digits long and will enter Chris Caldwell's The Largest Known Primes Database ranked 208th 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 8GB RAM, running Linux. This computer took about 1 hour 6 minutes to complete the primality test using LLR.

The prime was verified on 17 October 2017, 14:57:02 UTC by Amy Chambers (Buckeye74) of the United States using an Intel(R) Core(TM) i7-4770K CPU @ 3.50GHz with 16GB RAM, running Microsoft Windows 10 Core Edition. This computer took about 1 hour 13 minutes to complete the primality test using LLR. Amy is a member of the Sigma Omicron Chapter of Tau Kappa Epsilon team.

For more details, please see the official announcement.
18 Oct 2017 | 18:30:25 UTC · Comment


Diwali/Deepavali Challenge Starts Today!
Please note the start time of this challenge: 00:00:00

This is 18 hours earlier than usual. Don't be late!


Help us celebrate Diwali/Deepavali by participating in our 5 day challenge on the Riesel Problem LLR sub-project.

The challenge starts at 00:00:00 UTC tomorrow, October 18th (that's about 7 hours from now), and ends in 5 days at 00:00:00 UTC on October 23rd.

The last prime eliminating a k in the Riesel Problem was found on October 4th, 2014 -- just over three years ago!

For more information, please see the official challenge thread: http://www.primegrid.com/forum_thread.php?id=7623
17 Oct 2017 | 16:55:44 UTC · Comment


Another PPS-Mega Prime!
On 5 October 2017, 08:47:45 UTC, PrimeGrid’s PPS Mega Prime Search project found the Mega Prime:
911*2^3432643+1

The prime is 1,033,331 digits long and will enter Chris Caldwell's The Largest Known Primes Database ranked 208th 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 Windows 7 Professional Edition. This computer took about 1 hour 25 minutes to complete the primality test using LLR. Jochen is a member of the SETI.Germany team.

The prime was verified on 6 October 2017, 22:29:00 UTC by Georgios Magklaras (georgios) of Greece using an Intel(R) Xeon(R) E5-2650 v3 CPU @ 2.30GHz with 128GB RAM, running Linux. This computer took about 2 hours 28 minutes to complete the primality test using LLR. Georgios is a member of the Team Norway team.

For more details, please see the official announcement.
9 Oct 2017 | 13:15:21 UTC · Comment


PRPNet server set to "No New Work"
As part of our upcoming server move, effective immediately PRPNet will not be giving out new work. Jobs in progress can still be returned for credit, but no more new tasks will be sent out from the server.

This only affects the PRPNet server. The BOINC server is not affected by this change.

Please see this thread for more information and discussion.
5 Oct 2017 | 15:09:27 UTC · Comment


New SR5 Mega Prime!
On 17 September 2017, 20:18:24 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=301562 by finding the mega prime:

301562*5^2408646-1

The prime is 1,683,577 digits long and will enter Chris Caldwell's The Largest Known Primes Database ranked 57th overall. 72 k's now remain in the Riesel Base 5 Problem.

The discovery was made by Håkan Lind (sangis43) of Sweden using an Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz with 32 GB RAM running Microsoft Windows 7 Professional Edition. This computer took about 43 hours 57 minutes to complete the primality test using LLR. Håkan is a member of the Sicituradastra. Team.

For more details, please see the official announcement.

Double-checker information TBA.
29 Sep 2017 | 14:22:32 UTC · Comment


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Newly reported primes

62647522^32768+1 (Kwartet!); 3763030255455*2^1290000-1 (蔡修偉); 1147*2^3435970+1 (Randall J. Scalise); 62537488^32768+1 (Vortac); 7889*2^1459863+1 (Scott Brown); 3761945859327*2^1290000-1 (Randall J. Scalise); 62422592^32768+1 (GeoffreyY); 3758288136867*2^1290000-1 (zunewantan); 2193*2^1459700+1 (evaotaku00); 62327894^32768+1 (Roadranner); 62318154^32768+1 (DaveSun); 3756865004235*2^1290000-1 (zunewantan); 3750844144887*2^1290000-1 (Krzysiak_PL_GDA); 62137258^32768+1 (boss); 62105082^32768+1 (nic); 3750677675607*2^1290000-1 (Máté Börcsök); 62094976^32768+1 (Roadranner); 3749706282045*2^1290000-1 (SEK); 62032036^32768+1 (Roadranner); 61978760^32768+1 (Roadranner)

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