1,1

Also numbers n such that (56*10^n+61)/9 is prime.

Makoto Kamada, Factorizations of 622...229.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(56*10^n + 61)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A036279 A156769 A029758 this_sequence A012474 A122579 A138303

Adjacent sequences: A103028 A103029 A103030 this_sequence A103032 A103033 A103034

bref,more,nonn

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