1,2

Also numbers n such that (38*10^n+61)/9 is prime.

Makoto Kamada, Factorizations of 422...229.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(38*10^n + 61)/9], Print[n]], {n, 0, 10000}]

Adjacent sequences: A102984 A102985 A102986 this_sequence A102988 A102989 A102990

Sequence in context: A116994 A096730 A024047 this_sequence A004814 A081176 A034316

bref,more,nonn

Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 17 2005