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%I #4 Dec 15 2017 17:37:09
%S 0,19,59,291,327,3951
%N Numbers n such that 1+20^n+200^n is prime.
%C No more terms up to n=6900.
%o (PARI) is(n)=ispseudoprime(1+20^n+200^n) \\ _Charles R Greathouse IV_, Jun 13 2017
%K nonn
%O 0,2
%A _Jason Earls_, Dec 06 2009
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