1,2

Also numbers n such that (71*10^n-53)/9 is prime.

Makoto Kamada, Factorizations of 788...883.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(71*10^n - 53)/9], Print[n]], {n, 0, 10000}]

Adjacent sequences: A103063 A103064 A103065 this_sequence A103067 A103068 A103069

Sequence in context: A012473 A058161 A012877 this_sequence A137123 A137133 A137137

more,nonn

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