1,2

Also numbers n such that (67*10^n+41)/9 is prime.

Makoto Kamada, Factorizations of 744...449.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(67*10^n + 41)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A123801 A000289 A004031 this_sequence A123809 A124624 A059213

Adjacent sequences: A103056 A103057 A103058 this_sequence A103060 A103061 A103062

more,nonn

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