1,1

Also numbers n such that (55*10^n+17)/9 is prime.

Makoto Kamada, Factorizations of 611...113.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(55*10^n + 17)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A087583 A111214 A066159 this_sequence A093902 A100475 A072538

Adjacent sequences: A103024 A103025 A103026 this_sequence A103028 A103029 A103030

more,nonn

Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005