1,2

Also numbers n such that (28*10^n+71)/9 is prime.

Makoto Kamada, Factorizations of 311...119.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(28*10^n+71)/9], Print[n]], {n, 0, 10000}]

Adjacent sequences: A102962 A102963 A102964 this_sequence A102966 A102967 A102968

Sequence in context: A035331 A050819 A037121 this_sequence A100931 A042135 A003009

more,nonn

Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 17 2004