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%I #4 Jun 13 2017 12:56:52
%S 17,21,31,55,85,91,121,159,175,379,555,769
%N Numbers n such that 2^(2*n-33)-33 is prime.
%e 2^(2*21-33)-33=479, 2^(2*31-33)-33=536870879, 2^(2*55-33)-33=151115727451828646838239, ...
%t q=33;For[i=q,i<=q,a={};Do[x=2^(2*n-i)-i;If[PrimeQ[x],AppendTo[a,n]],{n,10^3}];Print["2^(2*n-",i,")-",i," ",a];i=i+2]
%o (PARI) is(n)=isprime(2^(2*n-33)-33) \\ _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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