1,2

Also numbers n such that (37*10^n-1)/9 is prime.

Makoto Kamada, Factorizations of 411...11

Index entries for primes involving repunits

Do[ If[ PrimeQ[ 4*10^n + (10^n-1)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A146379 A056714 A120074 this_sequence A052454 A066947 A031011

Adjacent sequences: A056703 A056704 A056705 this_sequence A056707 A056708 A056709

hard,nonn

Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 10 2000