1,2

Also numbers n such that (74*10^n+61)/9 is prime.

Makoto Kamada, Factorizations of 822...229.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(74*10^n + 61)/9], Print[n]], {n, 0, 10000}]

Adjacent sequences: A103074 A103075 A103076 this_sequence A103078 A103079 A103080

Sequence in context: A023674 A139218 A017988 this_sequence A090980 A024808 A077866

more,nonn

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