1,1
Also numbers n such that (43*10^n+11)/9 is prime.
Table of n, a(n) for n=1..7.
Makoto Kamada, Factorizations of 477...779.
Index entries for primes involving repunits.
Do[ If[ PrimeQ[(43*10^n + 11)/9], Print[n]], {n, 0, 10000}]
Sequence in context: A182146 A218077 A088888 * A189896 A095182 A104465
Adjacent sequences: A102993 A102994 A102995 * A102997 A102998 A102999
more,nonn
Robert G. Wilson v, Jan 17 2005
approved
