On 5 March 2020, 14:40:22 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=35816 by finding the mega prime:
The prime is 2,058,677 digits long and enters Chris Caldwell's “The Largest Known Primes Database” ranked 73rd overall and is the largest known base 5 prime. 66 k’s now remain in the Riesel Base 5 problem.
The discovery was made by Pavel Atnashev (Pavel Atnashev) of Russia using an Intel(R) Xeon(R) E5-2660 v2 CPU @ 2.20GHz with 8GB RAM running Linux. This computer took about 3 hours 56 minutes to complete the primality test using LLR. Pavel Atnashev is a member of the Ural Federal University team.
The prime was verified on 6 March 2020, 21:41:36 UTC by John Hall (JH30895) of the United States using an Intel(R) Xeon(R) W-3245 CPU @ 3.20GHz with 385GB RAM, running Darwin 19.3.0. This computer took about 1 day, 7 hours 33 minutes to complete the primality test using LLR. John Hall is a member of the Antarctic Crunchers team.
For more details, please see the official announcement.