1,2

Also numbers n such that (65*10^n-11)/9 is prime.

Makoto Kamada, Factorizations of 722...221.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(65*10^n - 11)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A100275 A145229 A160996 this_sequence A087055 A135556 A163095

Adjacent sequences: A103049 A103050 A103051 this_sequence A103053 A103054 A103055

more,nonn

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