On 28 Feb 2012, 15:51:22 UTC, PrimeGrid’s 27121 Prime Search, through PRPNet and in collaboration with the 12121 Search (k=27 sister project), has found the mega prime: 27*2^3855094-1
The prime is 1,160,501 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 34th overall. This is PrimeGrid's 23rd mega prime.
The discovery was made by Pietari Snow (Lumiukko) of Finland using an Intel Intel Xeon E5410 @ 2.33GHz with 12GB RAM, running Microsoft Windows Server 2003 64 bit. This computer took just over 4 hours 13 minutes to complete the primality test using LLR. Pietari is a member of the PrimeSearchTeam.
For more details, please see the official announcement.