1,2

Also numbers n such that (67*10^n-13)/9 is prime.

Makoto Kamada, Factorizations of 744...443.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(67*10^n - 13)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A006962 A090819 A059697 this_sequence A161442 A135834 A106946

Adjacent sequences: A103055 A103056 A103057 this_sequence A103059 A103060 A103061

more,nonn

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