1,2

Also numbers n such that (43*10^n-61)/9 is prime.

Makoto Kamada, Factorizations of 477...771.

Index entries for primes involving repunits.

Do[ If[ PrimeQ[(43*10^n - 61)/9], Print[n]], {n, 0, 10000}]

Sequence in context: A160037 A152957 A095696 this_sequence A041927 A041924 A160139

Adjacent sequences: A102992 A102993 A102994 this_sequence A102996 A102997 A102998

more,nonn

Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 17 2005

Two more PRP terms from Serge Batalov (batalovs(AT)yahoo.com), Feb 15 2009