On 15 March 2016, 18:24:24 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=92158 by finding the mega prime:
The prime is 1,499,313 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 53rd overall. This is the largest known base 5 mega prime. 33 k's now remain in the Sierpinski Base 5 Problem.
The discovery was made by Karl Burridge (Aus_Karlos) of Australia using an Intel(R) Core(TM) i7 CPU 950 @ 3.07GHz with 8GB RAM running Linux. This computer took about 43 hours 17 minutes to complete the primality test using LLR.
For more details, please see the official announcement.