1,1

Also numbers n such that (53*10^n-71)/9 is prime.

Makoto Kamada, Factorizations of 588...881.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(53*10^n - 71)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A030052 A099678 A050563 this_sequence A086189 A137082 A099414

Adjacent sequences: A103019 A103020 A103021 this_sequence A103023 A103024 A103025

more,nonn

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