1,1

Also numbers n such that (61*10^n+11)/9 is prime.

Makoto Kamada, Factorizations of 677...779.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(61*10^n + 11)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A119472 A018568 A038375 this_sequence A018601 A006394 A018650

Adjacent sequences: A103040 A103041 A103042 this_sequence A103044 A103045 A103046

more,nonn

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