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%I #25 Jun 13 2017 14:31:29
%S 127,18013,39623
%N Numbers n such that (47^n - 1)/46 is prime.
%o (PARI) is(n)=ispseudoprime((47^n-1)/46) \\ _Charles R Greathouse IV_, Jun 13 2017
%K nonn,more,hard
%O 1,1
%A _Tim Johannes Ohrtmann_, Feb 22 2016