1,1

Also numbers n such that (76*10^n+23)/9 is prime.

Makoto Kamada, Factorizations of 844...447.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(76*10^n + 23)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A133660 A057663 A056244 this_sequence A003112 A130187 A054266

Adjacent sequences: A103078 A103079 A103080 this_sequence A103082 A103083 A103084

more,nonn

Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2005