1,3

Also numbers n such that (34*10^n-61)/9 is prime.

Makoto Kamada, Factorizations of 377...771.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(34*10^n-61)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A056266 A157860 A125242 this_sequence A141852 A142052 A139930

Adjacent sequences: A102973 A102974 A102975 this_sequence A102977 A102978 A102979

more,nonn

Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 17 2004