1,2

Also numbers n such that (26*10^n-71)/9 is prime.

Makoto Kamada, Factorizations of 288...881.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(26*10^n - 71)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A031048 A098707 A152811 this_sequence A166151 A154149 A119201

Adjacent sequences: A102957 A102958 A102959 this_sequence A102961 A102962 A102963

more,nonn

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