SR5 Mega Prime!
On 18 October 2014, 6:18:40 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=109208 by finding the mega prime: 109208*5^1816285+1 The prime is 1,269,534 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 59th overall. This is the largest known base 5 mega prime. 37 k's now remain in the Sierpinski Base 5 Problem. The discovery was made by Scott Brown (Scott Brown) of the United States using an Intel(R) Core(TM)2 Quad CPU Q6700 @ 2.66GHz with 8GB RAM running Windows 7 Enterprise. This computer took about 11 hours and 3 minutes to complete the primality test using LLR. Scott is a member of the Duke University team. The prime was verified on 21 October 2014, 6:19:48 UTC, by Tod Slakans (NeoMetal*) of the United States using an Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz with 8GB RAM running Microsoft Windows 7 Home Premium. This computer took about 3 hours and 11 minutes to complete the primality test using LLR. Tod is a member of the Sicituradastra. team. For more details, please see the official announcement.

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