1,1

Also numbers n such that (79*10^n-61)/9 is prime.

Makoto Kamada, Factorizations of 877...771.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(79*10^n - 61)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A078984 A041257 A041411 this_sequence A041601 A041827 A042089

Adjacent sequences: A103086 A103087 A103088 this_sequence A103090 A103091 A103092

more,nonn

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

1 more term. Next term exceeds 50000. Sean A. Irvine (sairvin(AT)xtra.co.nz), Sep 10 2009