1,1

Also numbers n such that (19*10^n+53)/9 is prime.

Makoto Kamada, Factorizations of 211...117.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(19*10^n + 53)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A017054 A127657 A054979 this_sequence A017138 A120465 A066610

Adjacent sequences: A102946 A102947 A102948 this_sequence A102950 A102951 A102952

more,nonn

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