Congratulations to 288larsson for finding our 6th SR5 prime of the year, and our 29th mega prime overall for 2016. That ties the our record for most mega primes discovered in one year, set in 2014.
The prime 180062*5^2249192-1 eliminates k=180062 from the base 5 Riesel problem. 74 ks remain.
This is largest known base 5 prime, and the 48th largest known prime overall.
My lucky number is 75898524288+1