1,2

Also numbers n such that (58*10^n-31)/9 is prime.

Makoto Kamada, Factorizations of 644...441.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(58*10^n - 31)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A000988 A002214 A100408 this_sequence A038952 A144589 A034794

Adjacent sequences: A103031 A103032 A103033 this_sequence A103035 A103036 A103037

more,nonn

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