Congratulations again to Honza Cholt for finding the 4th SR5 prime of 2018.

The prime 194368*5^2638045-1 found on 15 August 2018 eliminates k=194368 from the base 5 Riesel problem. The prime is 1,843,920 digits long and entered Chris Caldwell's “The Largest Known Primes Database” (

http://primes.utm.edu/primes) ranked 60th overall. 69 k's now remain in the Riesel Base 5 Problem.