1,2

Also numbers n such that (62*10^n-71)/9 is prime.

Makoto Kamada, Factorizations of 688...881.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(62*10^n - 71)/9], Print[n]], {n, 0, 10000}]

Adjacent sequences: A103041 A103042 A103043 this_sequence A103045 A103046 A103047

Sequence in context: A076270 A032821 A101576 this_sequence A114719 A116954 A102686

more,nonn

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