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%I
%S 13,14,15,16,17,19,29,31,41,44,59,76,77,95,107,197
%N Numbers n such that 2^(2*n-25)-25 is prime.
%e 2^(2*16-25)-25=103, 2^(2*17-25)-25=487, 2^(2*19-25)-25=8167, ...
%t q=25;For[i=q,i<=q,a={};Do[x=2^(2*n-i)-i;If[PrimeQ[x],AppendTo[a,n]],{n,10^2}];Print["2^(2*n-",i,")-",i," ",a];i=i+2]
%o (PARI) is(n)=isprime(2^(2*n-25)-25) \\ _Charles R Greathouse IV_, Jun 13 2017
%K nonn,easy
%O 1,1
%A _Vladimir Joseph Stephan Orlovsky_, May 13 2008
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