1,2

Also numbers n such that (16*10^n+11)/9 is prime.

Makoto Kamada, Factorizations of 177...779.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(16*10^n + 11)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A122208 A106358 A002510 this_sequence A062880 A066707 A107227

Adjacent sequences: A102940 A102941 A102942 this_sequence A102944 A102945 A102946

more,nonn

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