On 20 March 2018, 08:28:32 UTC, PrimeGrid’s Generalized Fermat Prime Search found the Generalized Fermat mega prime:
The prime is 3,310,478 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 2nd for Generalized Fermat primes and 22nd overall.
The discovery was made by Cesare Marini (Cesare Marini) of Italy using an NVIDIA GeForce GTX 1060 in an Intel(R) Core(TM) i7-6700 CPU at 3.40GHz with 32GB RAM, running Windows 10 Professional Edition. This GPU took about 1 hour 32 minutes to probable prime (PRP) test with GeneferOCL5.
The prime was verified on 20 March 2018, 19:46:06 UTC by Håkan Lind (sangis43) of Sweden using an NVIDIA GeForce GTX 1070 in an Intel(R) Core(TM) i7-4930K CPU @ 3.40GHz with 16GB RAM, running Windows 7 Professional Edition. This GPU took about 1 hour 16 minutes to probable prime (PRP) test with GeneferOCL5. Håkan is a member of the Sicituradastra. 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 21 hours 6 minutes to complete the primality test using LLR.
For more details, please see the official announcement.