PrimeGrid: Primorial prime found in PRPNet

Tis the season to be merry!!! :) With last week's Factorial prime and today's Primorial prime, this holiday is shaping up to be quite generous.The prime is only the 19th known p#-1 form and the 1st discovered in 18 years. It is the 1st found of both forms (p#+1, p#-1) in over 9 years. Needless to say, this is exceptionally rare. It almost doubles the size of the previous record of 392113#+1 (169966 digits).More details to come once the double check is complete.

More...