1,2

Also numbers n such that (64*10^n+71)/9 is prime.

Makoto Kamada, Factorizations of 711...119.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(64*10^n + 71)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A155951 A118242 A006276 this_sequence A095018 A081356 A018269

Adjacent sequences: A103048 A103049 A103050 this_sequence A103052 A103053 A103054

more,nonn

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