PrimeGrid: World Record Sophie Germain Prime!
On 29 February 2016 05:39:14 UTC, PrimeGrid’s Sophie Germain Prime Search found a World Record Sophie Germain prime: 2618163402417*2^1290000-1 (2p+1: 2618163402417*2^1290001-1 )
The prime is 388,342 digits long, eclipsing the previous record of 200,701 digits. It enters Chris Caldwell's “The Largest Known Primes Database ” ranked 1st for Sophie Germain primes and 3,747th overall.
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 4 GB RAM running Microsoft Windows 7 Enterprise. This computer, using LLR, took about 1 hour and 33 minutes to complete the primality test. Scott is a member of the Duke University team.
The prime was verified on 29 February 2016 06:21:47 UTC, by Vaughan Davies (vaughan ) of Australia using an Intel(R) Core(TM) i7-4770S CPU @ 3.10GHz with 32 GB RAM running Microsoft Windows 7 Ultimate. This computer, using LLR, took about 47 minutes to complete the primality test. Vaughan is a member of the AMD Users team.
For more details, please see the official announcement.
6-3-2016 14:50:22