1,2

Also numbers n such that (86*10^n+13)/9 is prime.

Makoto Kamada, Factorizations of 955...557.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(86*10^n + 13)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A106111 A142786 A139783 this_sequence A139910 A077789 A124291

Adjacent sequences: A103099 A103100 A103101 this_sequence A103103 A103104 A103105

more,nonn

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