1,2

Also numbers n such that (55*10^n+53)/9 is prime.

Makoto Kamada, Factorizations of 611...117.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(55*10^n + 53)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A004842 A022378 A160557 this_sequence A139732 A037313 A122127

Adjacent sequences: A103025 A103026 A103027 this_sequence A103029 A103030 A103031

more,nonn

Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005