1,2

Also numbers n such that (11*10^n+61)/9 is prime.

Makoto Kamada, Factorizations of 122...229.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(11*10^n + 61)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A038050 A032322 A111752 this_sequence A056447 A056437 A012275

Adjacent sequences: A102928 A102929 A102930 this_sequence A102932 A102933 A102934

more,nonn

Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 16 2004