1,1

Also numbers n such that (22*10^n-31)/9 is prime.

Makoto Kamada, Factorizations of 244...441.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(22*10^n - 31)/9], Print[n]], {n, 0, 10000}]

Adjacent sequences: A102949 A102950 A102951 this_sequence A102953 A102954 A102955

Sequence in context: A115114 A086209 A022490 this_sequence A065653 A102021 A082002

more,nonn

Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 17 2004