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Message boards : News : 321 Mega Prime! (2015 Edition)

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Scott BrownProject donor
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Joined: 17 Oct 05
Posts: 1750
ID: 1178
Credit: 5,463,665,496
RAC: 3,495,470
Discovered the World's First base 116 Generalized Cullen prime!!!Discovered 12 mega primesEliminated 6 conjecture "k"sDiscovered 1 Sophie Germain pairDiscovered 1 Fermat divisor2012 Tour de Primes highest prime count2012 Tour de Primes most Mountain Stage primes2015 Tour de Primes highest prime count2016 Tour de Primes highest prime countFound 23 primes in the 2018 Tour de PrimesFound 1 mega prime in the 2018 Tour de PrimesFound 2 primes in the 2018 Tour de Primes Mountain Stage321 LLR Double Bronze: Earned 100,000,000 credits (100,829,118)Cullen LLR Double Bronze: Earned 100,000,000 credits (103,702,522)ESP LLR Double Bronze: Earned 100,000,000 credits (103,603,483)Generalized Cullen/Woodall LLR Double Bronze: Earned 100,000,000 credits (102,075,655)PPS LLR Double Silver: Earned 200,000,000 credits (303,052,366)PSP LLR Emerald: Earned 50,000,000 credits (80,100,999)SoB LLR Double Bronze: Earned 100,000,000 credits (116,841,417)SR5 LLR Double Bronze: Earned 100,000,000 credits (128,082,629)SGS LLR Double Bronze: Earned 100,000,000 credits (143,876,598)TPS LLR (retired) Silver: Earned 100,000 credits (235,439)TRP LLR Double Bronze: Earned 100,000,000 credits (109,149,031)Woodall LLR Double Bronze: Earned 100,000,000 credits (100,484,392)321 Sieve (suspended) Turquoise: Earned 5,000,000 credits (8,322,150)Cullen/Woodall Sieve (suspended) Emerald: Earned 50,000,000 credits (83,794,448)Generalized Cullen/Woodall Sieve Double Silver: Earned 200,000,000 credits (234,098,892)PPS Sieve Double Ruby: Earned 2,000,000,000 credits (2,105,648,836)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Double Silver: Earned 200,000,000 credits (203,523,358)TRP Sieve (suspended) Double Silver: Earned 200,000,000 credits (201,489,157)AP 26/27 Double Bronze: Earned 100,000,000 credits (101,243,298)GFN Double Gold: Earned 500,000,000 credits (874,503,593)PSA Double Silver: Earned 200,000,000 credits (259,058,048)
Message 84785 - Posted: 13 Apr 2015 | 1:01:19 UTC

On 13 March 2015, 19:55:59 UTC, PrimeGrid’s 321 Prime Search project found the mega prime:

3*2^11731850-1

The prime is 3,531,640 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 12th overall. This is the largest known 321 mega prime and the largest prime found to date at PrimeGrid!

The discovery was made by Karsten Klopffleisch (KarstenK) of Germany using an Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz with 16 GB RAM running Linux. This computer took about 18 hours and 33 minutes to complete the primality test using LLR.

The prime was verified on 18 March 2015 18:17:44 UTC, by Thomas Gbenro (dagee) of Germany using an Intel(R) Core(TM) i5-2500 CPU @ 3.30GHz with 4 GB RAM running Microsoft Windows 7 Enterprise. This computer took about 12 hours and 16 minutes to complete the primality test using LLR. Thomas is a member of the BOINC@Frankfurt Team.

For more details, please see the official announcement.

Scott BrownProject donor
Volunteer moderator
Project administrator
Volunteer tester
Project scientist
Avatar
Send message
Joined: 17 Oct 05
Posts: 1750
ID: 1178
Credit: 5,463,665,496
RAC: 3,495,470
Discovered the World's First base 116 Generalized Cullen prime!!!Discovered 12 mega primesEliminated 6 conjecture "k"sDiscovered 1 Sophie Germain pairDiscovered 1 Fermat divisor2012 Tour de Primes highest prime count2012 Tour de Primes most Mountain Stage primes2015 Tour de Primes highest prime count2016 Tour de Primes highest prime countFound 23 primes in the 2018 Tour de PrimesFound 1 mega prime in the 2018 Tour de PrimesFound 2 primes in the 2018 Tour de Primes Mountain Stage321 LLR Double Bronze: Earned 100,000,000 credits (100,829,118)Cullen LLR Double Bronze: Earned 100,000,000 credits (103,702,522)ESP LLR Double Bronze: Earned 100,000,000 credits (103,603,483)Generalized Cullen/Woodall LLR Double Bronze: Earned 100,000,000 credits (102,075,655)PPS LLR Double Silver: Earned 200,000,000 credits (303,052,366)PSP LLR Emerald: Earned 50,000,000 credits (80,100,999)SoB LLR Double Bronze: Earned 100,000,000 credits (116,841,417)SR5 LLR Double Bronze: Earned 100,000,000 credits (128,082,629)SGS LLR Double Bronze: Earned 100,000,000 credits (143,876,598)TPS LLR (retired) Silver: Earned 100,000 credits (235,439)TRP LLR Double Bronze: Earned 100,000,000 credits (109,149,031)Woodall LLR Double Bronze: Earned 100,000,000 credits (100,484,392)321 Sieve (suspended) Turquoise: Earned 5,000,000 credits (8,322,150)Cullen/Woodall Sieve (suspended) Emerald: Earned 50,000,000 credits (83,794,448)Generalized Cullen/Woodall Sieve Double Silver: Earned 200,000,000 credits (234,098,892)PPS Sieve Double Ruby: Earned 2,000,000,000 credits (2,105,648,836)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Double Silver: Earned 200,000,000 credits (203,523,358)TRP Sieve (suspended) Double Silver: Earned 200,000,000 credits (201,489,157)AP 26/27 Double Bronze: Earned 100,000,000 credits (101,243,298)GFN Double Gold: Earned 500,000,000 credits (874,503,593)PSA Double Silver: Earned 200,000,000 credits (259,058,048)
Message 84786 - Posted: 13 Apr 2015 | 1:03:10 UTC


A bit more information:

This was PrimeGrid's 7th mega prime discovery of 2015 and our 71st mega prime discovery overall. (We also share credit for the discovery of 3 additional mega primes discovered by PSP.)

This was the second mega prime discovered in March.

PrimeGrid has discovered at least one mega prime in each of the last 16 months.

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Message boards : News : 321 Mega Prime! (2015 Edition)

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