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Message boards : News : First base 5 mega prime found!

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Profile Michael GoetzProject donor
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The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de Primes321 LLR Ruby: Earned 2,000,000 credits (2,063,182)Cullen LLR Ruby: Earned 2,000,000 credits (2,005,249)ESP LLR Ruby: Earned 2,000,000 credits (2,001,789)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,004,898)PPS LLR Ruby: Earned 2,000,000 credits (2,616,314)PSP LLR Ruby: Earned 2,000,000 credits (2,632,269)SoB LLR Sapphire: Earned 20,000,000 credits (28,631,663)SR5 LLR Turquoise: Earned 5,000,000 credits (7,468,031)SGS LLR Ruby: Earned 2,000,000 credits (2,010,466)TRP LLR Ruby: Earned 2,000,000 credits (2,433,520)Woodall LLR Ruby: Earned 2,000,000 credits (2,176,414)321 Sieve (suspended) Silver: Earned 100,000 credits (200,576)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (20,110,788)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Turquoise: Earned 5,000,000 credits (7,086,053)GFN Emerald: Earned 50,000,000 credits (59,432,822)PSA Jade: Earned 10,000,000 credits (10,038,118)
Message 71431 - Posted: 18 Dec 2013 | 3:53:50 UTC
Last modified: 18 Dec 2013 | 3:59:49 UTC

On 4 December 2013, 20:53:51 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=173198 by finding the mega prime:

173198*5^1457792-1

The prime is 1,018,959 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 67th overall. This is the first known base 5 mega prime. 88 k's now remain in the Riesel Base 5 Problem.

The discovery was made by Motohiro Ohno (syusui) of Japan using an Intel(R) Core(TM) i3-2120 CPU @ 3.30GHz with 4GB RAM running Microsoft Windows 7 Home Premium. This computer took about 22 hours and 29 minutes to complete the primality test using LLR. Motohiro is a member of the Team 2ch team.

The prime was verified on 6 December 2013 5:27:38 UTC, by Scott Brown (Scott Brown) of the United States using an Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz with 8 GB RAM running Microsoft Windows 7 Home Premium. This computer took about 33 hours and 22 minutes to complete the primality test using LLR. Scott is a member of the Duke University team.

For more details, please see the official announcement.
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Message boards : News : First base 5 mega prime found!

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