PrimeGrid: GFN-524288 Mega Prime!
On 24 December 2019, 08:20:15 UTC, PrimeGrid's Generalized Fermat Prime Search found the Mega Prime:
3214654^524288+1
The prime is 3,411,613 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 3rd] for Generalized Fermat primes and 30th overall.
The discovery was made by Alen Kecic (Freezing )of Germany using a GeForce GTX 1660 Ti in an Intel(R) Core(TM) i7-7820X CPU @ 3.60GHz with 32GB RAM, running Microsoft Windows 10 Professional x64 Edition. This GPU took about 51 minutes to complete the probable prime (PRP) test using GeneferOCL5. Alen is a member of the SETI.Germany Team.
The PRP was verified on 24 December 2019, 10:12:18 UTC by John Holmes (John J. Holmes ) of the United States using a GeForce GTX 970 in an Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz with 16GB RAM, running Microsoft Windows 10 Professional x64 Edition. This computer took about 2 hours, 4 minutes to complete the probable prime (PRP) test using GeneferOCL3.
The PRP was confirmed prime by an Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz with 32GB RAM, running Microsoft Windows 10 Professional x64 Edition. This computer took about 1 day, 1 hour, 45 minutes to complete the primality test using multithreaded LLR.
For more details, please see the official announcement .