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Message boards : News : SR5 Mega Prime - January 2016 Edition

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Scott BrownProject donor
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Joined: 17 Oct 05
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Credit: 5,532,127,150
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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 (103,870,990)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 (88,718,103)SoB LLR Double Bronze: Earned 100,000,000 credits (116,841,417)SR5 LLR Double Bronze: Earned 100,000,000 credits (129,423,098)SGS LLR Double Bronze: Earned 100,000,000 credits (148,139,724)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 (101,356,263)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 (240,472,670)PPS Sieve Double Ruby: Earned 2,000,000,000 credits (2,105,665,691)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 (119,533,830)GFN Double Gold: Earned 500,000,000 credits (902,983,443)PSA Double Silver: Earned 200,000,000 credits (259,058,048)
Message 91772 - Posted: 1 Feb 2016 | 2:05:49 UTC

On 11 January 2016, 10:02:08 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=306398 by finding the mega prime:

306398*5^2112410-1

The prime is 1,476,517 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 50th overall. This is the largest known base 5 mega prime. 77 k's now remain in the Riesel Base 5 Problem.

The discovery was made by André Ahlfors Dahl (NocFlame) of Sweden using an Intel(R) Xeon(R) CPU W3520 @ 2.67GHz with 16GB RAM running Linux. This computer took about 77 hours 10 minutes to complete the primality test using LLR. André is a member of the Gridcoin team.

The prime was verified on 17 January 2016, 19:36:26 UTC by evaotaku00 of the United States using an Intel(R) Xeon(R) CPU X5355 @ 2.66GHz with 24GB RAM running Darwin. This computer took about 77 hours 10 minutes to complete the primality test using LLR. evaotaku00 is a member of the Ars Technica team.

For more details, please see the official announcement.

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Message boards : News : SR5 Mega Prime - January 2016 Edition

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