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Old 2018-09-16, 01:10   #7
TheCount's Avatar
Sep 2013
Perth, Au.

2·72 Posts
Thumbs up S/R Base 5 Prime reported in 2018

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” ( ranked 60th overall. 69 k's now remain in the Riesel Base 5 Problem.
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