On 29 December 2013, 18:56:35 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=37292 by finding the mega prime:
The prime is 1,040,065 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 65th overall. This is the largest known base 5 mega prime. 41 k's now remain in the Sierpinski Base 5 Problem.
The discovery was made by Stephen R. Cilliers (SteveRC) of South Africa using an Intel(R) Core(TM) i5-3230M CPU @ 2.60GHz with 8 GB RAM running Microsoft Windows 8.1. This computer took about 3 hours and 50 minutes to complete the primality test using LLR. Stephen is a member of the Clifford Welding Systems team.
The prime was verified on 30 December 2013 1:48:41 UTC, by [AF>France>Aquitaine>Cote-Adour-et-Gaves]Bernard 64250 of France using an Intel(R) Core(TM) i3-2330M CPU @ 2.20GHz with 4 GB RAM running Microsoft Windows 7 Home Premium. This computer took about 5 hours and 1 minute to complete the primality test using LLR. [AF>France>Aquitaine>Cote-Adour-et-Gaves]Bernard 64250 is a member of the L'Alliance Francophone team.
For more details, please see the official announcement.