1,1

Also numbers n such that (55*10^n+71)/9 is prime.

Makoto Kamada, Factorizations of 611...119.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(55*10^n + 71)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A100269 A128697 A089663 this_sequence A122862 A137105 A007082

Adjacent sequences: A103026 A103027 A103028 this_sequence A103030 A103031 A103032

more,nonn

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