1,2

Also numbers n such that (11*10^n+43)/9 is prime.

Makoto Kamada, Factorizations of 122...227.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(11*10^n + 43)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A074716 A090889 A096012 this_sequence A135113 A050564 A047830

Adjacent sequences: A102927 A102928 A102929 this_sequence A102931 A102932 A102933

more,nonn

Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 16 2004