On 23 February 2017, 02:20:15 UTC, PrimeGrid’s Generalized Fermat Prime Search found the Generalized Fermat mega prime:
The prime is 1,003,520 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 20th for Generalized Fermat primes and 223rd overall.
The discovery was made by William Donovan (Williamd007) of the United States using an NVIDIA GeForce GTX 1070 in an Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz with 16GB RAM, running Microsoft Windows 10 Core Edition. This GPU took about 9 minutes to probable prime (PRP) test with GeneferOCL4. William is a member of The Knights Who Say Ni! team.
The prime was verified on 23 February 2017, 06:00:13 UTC by Andrea Tosatto (Andrea Tosatto - Italy) of Italy using an Intel(R) Core(TM)2 Duo CPU @ 3.00GHz with 2GB RAM, running Microsoft Windows 7 Professional Edition. This computer took about 9 hours 17 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 1 hour 17 minutes to complete the primality test using LLR.
For more details, please see the official announcement.