On 9 March 2020, 21:32:46, PrimeGridâ€™s Sierpinski/Riesel Base 5 Problem project eliminated k=146264 by finding the mega prime:
The prime is 2,064,261 digits long and enters Chris Caldwell's â€œThe Largest Known Primes Databaseâ€ ranked 74th overall and is the largest known base 5 prime. 65 kâ€™s now remain in the Riesel Base 5 problem.
The discovery was made by Wolfgang Schwieger (DeleteNull) of Germany using an Intel(R) Core(TM) i5-8600K CPU @ 3.60GHz with 8GB RAM, running Microsoft Windows 10 Professional x64 Edition. This computer took about 6 hours, 25 minutes to complete the primality test using LLR. Wolfgang Schwieger is a member of the SETI.Germany team.
The prime was verified internally using an Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz with 32GB RAM, running Linux Debian.
For more details, please see the official announcement.