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.