1,2

Also numbers n such that (11*10^n+1)/3 is prime.

Makoto Kamada, Factorizations of 366...667.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(11*10^n+1)/3], Print[n]], {n, 0, 10000}]

Sequence in context: A077103 A036499 A107607 this_sequence A120300 A071566 A113802

Adjacent sequences: A102972 A102973 A102974 this_sequence A102976 A102977 A102978

more,nonn

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