PrimeGrid: World Record 321 Prime

On 21 Feb 2011 21:45:32 UTC, PrimeGrid’s 321 Prime Search found another Mega Prime: 3*2^7033641+1 The prime is 2,117,338 digits long and will enter Chris Caldwell's The Largest Known Primes Database ranked 14th overall. This is the second mega prime and the largest for the 3*2^n+1 form. It is also the second largest found mega prime using LLR and PrimeGrid's 10th overall mega prime. The discovery was made by Michael Herder using an Intel Core i7 920 @ 2.67GHz with 6 GB RAM running Windows 7 Ultimate x64. This computer took just over 17 hours and 24 minutes to complete the primality test using LLR. Michael is a member of the BOINCstats team. For more details, please see the official announcement.

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