PrimeGrid: New SR5 Mega Prime Found!

On 9 April 2014, 9:13:42 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=330286 by finding the mega prime: 104944*5^1610735-1The prime is 1,125,861 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 59th overall. This is the largest known base 5 mega prime. 84 k's now remain in the Riesel Base 5 Problem.The discovery was made by Brian Smith (Sherlock Holmes) of Germany using an Intel(R) Core(TM)2 Duo CPU T9800 @ 2.93GHz with 4GB RAM running Microsoft Windows 7 Professional. This computer took about 27 hours and 21 minutes to complete the primality test using LLR. The prime was verified on 9 April 2014 15:47:16 UTC, by Dave Sunderland (DaveSun) of the United States using an Intel(R) Core(TM)2 Quad CPU Q9300 @ 2.50GHz with 4 GB RAM running Microsoft Windows XP Professional. This computer took about 30 hours and 46 minutes to complete the primality test using LLR. For more details, please see the official announcement.

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