1,1

Also numbers n such that (37*10^n+71)/9 is prime.

Makoto Kamada, Factorizations of 411...119.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(37*10^n + 71)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A007506 A042693 A128297 this_sequence A038583 A082080 A127997

Adjacent sequences: A102980 A102981 A102982 this_sequence A102984 A102985 A102986

more,nonn

Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 21 2004