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Message boards : News : Another Record SR5 Prime!

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Scott BrownProject donor
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Tour de Primes 2012Tour de Primes 2012Tour de Primes 2015Tour de Primes 2016321 LLR Emerald: Earned 50,000,000 credits (60,457,269)Cullen LLR Emerald: Earned 50,000,000 credits (55,971,124)ESP LLR Emerald: Earned 50,000,000 credits (68,941,398)Generalized Cullen/Woodall LLR Emerald: Earned 50,000,000 credits (56,429,081)PPS LLR Double Silver: Earned 200,000,000 credits (260,344,219)PSP LLR Emerald: Earned 50,000,000 credits (74,170,654)SoB LLR Emerald: Earned 50,000,000 credits (51,979,891)SR5 LLR Double Bronze: Earned 100,000,000 credits (105,171,537)SGS LLR Double Bronze: Earned 100,000,000 credits (141,212,728)TPS LLR (retired) Silver: Earned 100,000 credits (235,439)TRP LLR Double Bronze: Earned 100,000,000 credits (101,973,682)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 (106,287,841)PPS Sieve Double Ruby: Earned 2,000,000,000 credits (2,018,508,486)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 (556,963,090)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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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.
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Carlos Pinho
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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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