1,1

Also numbers n such that (22*10^n+23)/9 is prime.

Makoto Kamada, Factorizations of 244...447.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(22*10^n + 23)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A016945 A110108 A162843 this_sequence A162486 A067201 A071526

Adjacent sequences: A102951 A102952 A102953 this_sequence A102955 A102956 A102957

more,nonn

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