On 24 February 2017, 07:16:40 UTC, PrimeGrid’s Generalized Fermat Prime Search found the Generalized Fermat mega prime:
The prime is 1,677,825 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 William de Thomas (wdethomas) of Puerto Rico using an NVIDIA GeForce GTX Titan X in an Intel(R) Core(TM) i7-4790K CPU at 4.00GHz with 16GB RAM, running Microsoft Windows 10 Professional Edition. This GPU took about 18 minutes to probable prime (PRP) test with GeneferOCL4. William is a member of the Puerto Rico Assisting Science team.
The prime was verified on 24 February 2017, 12:21:21 UTC by Hans-Jürgen Bergelt (Hans-Jürgen Bergelt) of Germany using an NVIDIA GeForce GTX 690 in an Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz with 8GB RAM, running Microsoft Windows 10 Core Edition. This GPU took about 37 minutes to probable prime (PRP) test with GeneferOCL4. Hans-Jürgen is a member of the SETI.Germany 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 8 hours 7 minutes to complete the primality test using LLR.
For more details, please see the official announcement.