On 24 November 2016, 03:05:38 UTC, PrimeGrid’s Generalized Fermat Prime Search found the Generalized Fermat mega prime:
The prime is 1,654,187 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 5th for Generalized Fermat primes and 47th overall.
The discovery was made by Tsuyoshi Ohsugi (motsu) of Japan using an NVIDIA GeForce GTX 750 Ti in an AMD Phenom(tm) II X6 1065T CPU with 12GB RAM, running Microsoft Windows 10 Professional. This GPU took about 1 hour 19 minutes to probable prime (PRP) test with GeneferOCL3. Tsuyoshi is a member of the Gridcoin team.
The prime was verified on 24 November 2016, 08:03:02 UTC by Michael Mamanakis (Michael Mamanakis) of the United States using an NVIDIA GeForce GTX 1080 in an Intel(R) Xeon(R) CPU E5-1603 @ 2.80GHz with 32GB RAM, running Microsoft Windows 7 Enterprise Edition. This GPU took about 25 minutes to probable prime (PRP) test with GeneferOCL4.
The PRP was confirmed prime by an Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz with 12GB RAM, running Windows 7 Professional. This computer took about 20 hours 36 minutes to complete the primality test using LLR.
For more information, please see the official announcement.