1,2

Also numbers n such that (73*10^n+17)/9 is prime.

Makoto Kamada, Factorizations of 811...113.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(73*10^n + 17)/9], Print[n]], {n, 0, 10000}]

Adjacent sequences: A103068 A103069 A103070 this_sequence A103072 A103073 A103074

Sequence in context: A058504 A126911 A135285 this_sequence A057462 A048195 A133634

more,nonn

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