On 11 March 2017, 18:07:33 UTC, PrimeGrid’s Generalized Fermat Prime Search found the Generalized Fermat mega prime:
The prime is 1,682,141 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 5th for Generalized Fermat primes and 52nd overall.
The discovery was made by Roman Vogt (Tabaluga) of Germany using an NVIDIA GeForce GTX 580 in an Intel(R) Core(TM) i7-2700K CPU @ 3.50GHz with 8GB RAM, running Microsoft Windows 10 Professional Edition. This GPU took about 46 minutes to probable prime (PRP) test with GeneferOCL4. Roman is a member of the Sicituradastra. team.
The prime was verified on 12 March 2017, 12:13:28 UTC by Markus Tervooren (mtervooren) of Germany using an AMD Ellesmere GPU in an AMD Phenom(tm) II X6 1090T with 8GB RAM, running Linux. This computer took about 29 minutes to complete the probable prime (PRP) test.
The PRP was confirmed prime by an Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz with 16GB RAM, running Windows 10 Professional Edition. This computer took about 7 hours 28 minutes to complete the primality test using LLR.
For more details, please see the official announcement.