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Message boards : News : Fermat Divisor!

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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 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 (103,736,560)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 (129,119,705)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 (100,831,299)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 (234,592,552)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 (108,718,805)GFN Double Gold: Earned 500,000,000 credits (875,842,785)PSA Double Silver: Earned 200,000,000 credits (259,058,048)
Message 83500 - Posted: 22 Feb 2015 | 20:15:26 UTC

On 13 February 2015 16:10:21 UTC, PrimeGrid's Proth Prime Search project found a prime Fermat divisor:

267*2^2662090+1 Divides F(2662088)

The prime is 801,372 digits long and entered Chris Caldwell's The Largest Known Primes Database ranked 3rd for prime Fermat divisors and 212th overall.

The discovery was made by Jay Parangalan (stellarfirefly) of the United States using an Intel(R) Core(TM) i7-3930K CPU @ 3.20GHz with 32GB RAM running Microsoft Windows 7 Ultimate. This computer took about 2 hours 23 minutes to complete the primality test using LLR.

The prime was verified on 14 February 2015 by user Lee of the United States using an Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz with 16GB RAM running Microsoft Windows 8.1 Professional. This computer took about 2 hours 1 minute to complete the primality test using LLR.

For more details, please see the official announcement.

JeppeSNProject donor
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321 LLR Bronze: Earned 10,000 credits (48,835)Cullen LLR Bronze: Earned 10,000 credits (98,851)ESP LLR Bronze: Earned 10,000 credits (13,226)PPS LLR Amethyst: Earned 1,000,000 credits (1,533,808)SoB LLR Silver: Earned 100,000 credits (132,293)SR5 LLR Bronze: Earned 10,000 credits (16,010)TRP LLR Bronze: Earned 10,000 credits (14,746)Woodall LLR Silver: Earned 100,000 credits (109,455)PSA Turquoise: Earned 5,000,000 credits (7,614,290)
Message 83528 - Posted: 24 Feb 2015 | 22:37:24 UTC - in response to Message 83500.

I love Fermat divisors. I wonder when rogue or someone will update http://www.prothsearch.com/fermat.html. This could be the first Fermat divisor found in 2015 (as I said in the other thread). /JeppeSN

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Message boards : News : Fermat Divisor!

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