1,2

Also numbers n such that (38*10^n+43)/9 is prime.

Makoto Kamada, Factorizations of 422...227.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(38*10^n + 43)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A045482 A006429 A016483 this_sequence A012160 A012197 A024264

Adjacent sequences: A102983 A102984 A102985 this_sequence A102987 A102988 A102989

more,nonn

Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 17 2005