1,2

Also numbers n such that (32*10^n-41)/9 is prime.

Makoto Kamada, Factorizations of 355...551.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(32*10^n-41)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A001748 A097426 A075278 this_sequence A023885 A031209 A031326

Adjacent sequences: A102968 A102969 A102970 this_sequence A102972 A102973 A102974

more,nonn

Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 17 2004