Congratulations to Selya Tsuji for finding the 1st SR5 prime of 2018.

The prime 327926*5^2542838-1 found on 19 June 2018 eliminates k=327926 from the base 5 Riesel problem. The prime is 1,777,374 digits long and entered Chris Caldwell's “The Largest Known Primes Database” (

http://primes.utm.edu/primes) ranked 60th overall. 71 k's now remain in the Riesel Base 5 Problem.

Congratulations to Jiří Bočan for finding the 2nd SR5 prime of 2018.

The prime 81556*5^2539960+1 found on 20 June 2018 eliminates k=81556 from the base 5 Sierpinski problem. The prime is 1,775,361 digits long and entered Chris Caldwell's “The Largest Known Primes Database” (

http://primes.utm.edu/primes) ranked 61st overall. 32 k's now remain in the Sierpinski Base 5 Problem.

Both of these primes were found just after the Primegrid SR5 challenge.