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Message boards : News : Another Record SR5 Prime!

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Scott BrownProject donor
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Joined: 17 Oct 05
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Discovered the World's First base 116 Generalized Cullen prime!!!Discovered 10 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 18 primes in the 2018 Tour de Primes321 LLR Emerald: Earned 50,000,000 credits (65,697,700)Cullen LLR Emerald: Earned 50,000,000 credits (56,029,731)ESP LLR Emerald: Earned 50,000,000 credits (77,284,331)Generalized Cullen/Woodall LLR Emerald: Earned 50,000,000 credits (75,419,165)PPS LLR Double Silver: Earned 200,000,000 credits (281,394,966)PSP LLR Emerald: Earned 50,000,000 credits (74,170,654)SoB LLR Double Bronze: Earned 100,000,000 credits (116,841,417)SR5 LLR Double Bronze: Earned 100,000,000 credits (112,816,795)SGS LLR Double Bronze: Earned 100,000,000 credits (142,252,516)TPS LLR (retired) Silver: Earned 100,000 credits (235,439)TRP LLR Double Bronze: Earned 100,000,000 credits (102,017,563)Woodall LLR Emerald: Earned 50,000,000 credits (53,866,823)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 Bronze: Earned 100,000,000 credits (117,513,837)PPS Sieve Double Ruby: Earned 2,000,000,000 credits (2,051,480,237)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 (100,770,267)GFN Double Gold: Earned 500,000,000 credits (653,074,687)PSA Double Silver: Earned 200,000,000 credits (257,080,048)
Message 73098 - Posted: 2 Feb 2014 | 21:07:30 UTC

On 31 January 2014, 9:53:06 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=178658 by finding the mega prime:

178658*5^1525224-1

The prime is 1,066,092 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 61st overall. This is the largest known base 5 mega prime. 87 k's now remain in the Riesel Base 5 Problem.

The discovery was made by Keishi Toda (yuyusuke@jisaku) of Japan using an Intel(R) Core(TM) i7-3930K CPU @ 3.20GHz with 14GB RAM running Microsoft Windows 7 Home Premium. This computer took about 19 hours and 59 minutes to complete the primality test using LLR. Keishi is a member of the Team 2ch team.

The prime was verified on 2 February 2014 0:15:42 UTC, by smmistak of the United States using an Intel(R) Core(TM) i7-2700K CPU @ 3.50GHz with 16 GB RAM running Microsoft Windows 7 Ultimate. This computer took about 59 hours and 27 minutes to complete the primality test using LLR.

For more details, please see the official announcement.

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Cullen LLR Bronze: Earned 10,000 credits (14,602)ESP LLR Bronze: Earned 10,000 credits (10,158)PPS LLR Bronze: Earned 10,000 credits (18,124)PSP LLR Bronze: Earned 10,000 credits (21,049)SoB LLR Bronze: Earned 10,000 credits (98,339)SR5 LLR Bronze: Earned 10,000 credits (12,188)SGS LLR Bronze: Earned 10,000 credits (62,305)TRP LLR Bronze: Earned 10,000 credits (17,022)PPS Sieve Turquoise: Earned 5,000,000 credits (5,137,404)
Message 73115 - Posted: 3 Feb 2014 | 6:45:40 UTC - in response to Message 73098.

Congratz to Keishi for this new discovery ! :)
Thanks for the update, Scott.
____________

Carlos Pinho
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PSA Silver: Earned 100,000 credits (101,642)
Message 73254 - Posted: 7 Feb 2014 | 16:44:49 UTC

Another one from him: http://primes.utm.edu/primes/page.php?id=117082
____________

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Message boards : News : Another Record SR5 Prime!

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