On 5 March 2016, 18:56:52 UTC, PrimeGrid’s Generalized Fermat Prime Search found the Generalized Fermat mega prime:
The prime is 1,618,131 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 5th for Generalized Fermat primes and 43rd overall.
The discovery was made by Stefan Larsson (288larsson) of Sweden using an AMD Hawaii in an Intel(R) Core(TM) i5-4670K CPU @ 3.40GHz with 8GB RAM, running Linux. This GPU took about 27 minutes to probable prime (PRP) test with GeneferOCL4. Stefan is a member of the Sicituradastra. team.
The prime was verified on 5 March 2016, 19:25:40 UTC by Dirk Kraemer (DoctorNow) of Germany using an NVIDIA GeForce GTX 760 in an AMD Phenom(tm) II X6 1045T Processor with 12GB RAM, running Windows Vista Home Premium. This GPU took about 1 hour and 5 minutes to probable prime (PRP) test with GeneferOCL3. Dirk is a member of the BOINC Confederation team.
For more details, please see the official announcement.