1,1

Also numbers n such that (61*10^n-43)/9 is prime.

Makoto Kamada, Factorizations of 677...773.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(61*10^n - 43)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A157087 A000725 A151614 this_sequence A142006 A124225 A159030

Adjacent sequences: A103039 A103040 A103041 this_sequence A103043 A103044 A103045

more,nonn

Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005