1,1

Also numbers n such that (89*10^n-71)/9 is prime.

Makoto Kamada, Factorizations of 988...881.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(89*10^n - 71)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A061401 A046498 A119738 this_sequence A121233 A156180 A053490

Adjacent sequences: A103104 A103105 A103106 this_sequence A103108 A103109 A103110

more,nonn

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