1,2

Also numbers n such that (79*10^n-43)/9 is prime.

Makoto Kamada, Factorizations of 877...773.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(79*10^n - 43)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A018199 A063168 A163683 this_sequence A097554 A055221 A080420

Adjacent sequences: A103087 A103088 A103089 this_sequence A103091 A103092 A103093

more,nonn

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