1,1

Also numbers n such that (77*10^n+13)/9 is prime.

Makoto Kamada, Factorizations of 855...557.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(77*10^n + 13)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A004491 A132573 A061591 this_sequence A084148 A014115 A014116

Adjacent sequences: A103082 A103083 A103084 this_sequence A103086 A103087 A103088

bref,more,nonn

Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2005