1,1

Also numbers n such that (59*10^n+31)/9 is prime.

Makoto Kamada, Factorizations of 655...559.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(59*10^n + 31)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A048139 A071085 A055236 this_sequence A006827 A062318 A112346

Adjacent sequences: A103038 A103039 A103040 this_sequence A103042 A103043 A103044

more,nonn

Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005