Quote:
Originally Posted by dabaichi
By googling 58426759 and 73278467, I found this page. The OP, that is also Arxenar, posted a link. Following the link, you can figure out what the "Theorem 1379" is.

Ah  that only numbers coprime to 10 (ending in 1, 3, 7, or 9) can be prime, presumably with the exception of 2 and 5. But that's gradeschool level, pretty far below the mersenneforums assumed level of competence.