1,1

Also numbers n such that (74*10^n-11)/9 is prime.

Makoto Kamada, Factorizations of 822...221.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(74*10^n - 11)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A053182 A076706 A019350 this_sequence A082979 A065952 A089983

Adjacent sequences: A103071 A103072 A103073 this_sequence A103075 A103076 A103077

more,nonn

Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 19 2005