1,2

Also numbers n such that (64*10^n+17)/9 is prime.

Makoto Kamada, Factorizations of 711...113.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(64*10^n + 17)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A099601 A028420 A051832 this_sequence A110111 A082164 A119670

Adjacent sequences: A103047 A103048 A103049 this_sequence A103051 A103052 A103053

bref,more,nonn

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