On 31 May 2017, 09:22:45 UTC, PrimeGrid’s Generalized Fermat Prime Search found the Generalized Fermat mega prime:
The prime is 1,004,848 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 23rd for Generalized Fermat primes and 235th overall.
The discovery was made by Matt Jurach (mattozan) of the United States using an AMD Pitcairn GPU in an Intel(R) Core(TM) i7-5820K CPU at 3.30GHz with 16GB RAM, running Microsoft Windows 7 Enterprise Edition. This GPU took about 42 minutes to probable prime (PRP) test with GeneferOCL2. Matt is a member of the Aggie The Pew team.
The prime was verified on 31 May 2017, 22:53:40 UTC by Krzysztof Ostaszewski (Krzysiak_PL_GDA) of Poland using an AMD R9 Fury Series GPU in an Intel(R) Xeon(R) E5-2683 v3 CPU at 2.00GHz with 32GB RAM, running Microsoft Windows 10 Professional Edition. This GPU took about 11 minutes to probable prime (PRP) test with GeneferOCL2. Krzysztof is a member of the BOINC@Poland team.
The PRP was confirmed prime by an Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz with 16GB RAM, running Microsoft Windows 10 Professional. This computer took about 2 hours 52 minutes to complete the primality test using LLR.
For more details, please see the official announcement.