1,2

Also numbers n such that (85*10^n+23)/9 is prime.

Makoto Kamada, Factorizations of 944...447.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(85*10^n + 23)/9], Print[n]], {n, 0, 10000}]

Adjacent sequences: A103096 A103097 A103098 this_sequence A103100 A103101 A103102

Sequence in context: A128299 A143672 A001510 this_sequence A119029 A128774 A129894

more,nonn

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