1,3

Also numbers n such that (26*10^n-53)/9 is prime.

Makoto Kamada, Factorizations of 288...883.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(26*10^n - 53)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A137108 A099815 A123363 this_sequence A155581 A048504 A092465

Adjacent sequences: A102958 A102959 A102960 this_sequence A102962 A102963 A102964

more,nonn

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