On 19 June 2018, 09:48:29 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=327926 by finding the mega prime:
The prime is 1,777,374 digits long and will enter Chris Caldwell's The Largest Known Primes Database ranked 60th overall. 71 k's now remain in the Riesel Base 5 Problem.
The discovery was made by Selya Tsuji (stsuji) of Japan using an Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz with 32 GB RAM running Microsoft Windows 10 Professional Edition. This computer took about 39 hours 37 minutes to complete the primality test using LLR. Selya is a member of Team 2ch.
For more details, please see the official announcement.