1,2

Also numbers n such that (38*10^n-11)/9 is prime.

Makoto Kamada, Factorizations of 422...221.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(38*10^n - 11)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A101805 A145777 A153550 this_sequence A103017 A091833 A026080

Adjacent sequences: A102981 A102982 A102983 this_sequence A102985 A102986 A102987

more,nonn

Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 22 2004