I didn't know such large Mersenne primes were in the OEIS in that way. Thanks. Al On 5/17/06, zak seidov <zakseidov at yahoo.com> wrote: > Or see: > A117853 Decimal expansion of 2^30402457-1. > COMMENT The decimal expansion of 2^30402457-1, > presently the 43rd known mersenne prime. Sequence ends > after 9,152,052 terms >