This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A162573 #3 Mar 31 2012 12:38:25
%S A162573 2,3,5,13,17,89,137,157,257,523,547,2089,2659,4217,8821,16553,34981,
%T A162573 65537,65761,262433,524309,524353,524971,2097223,2097289,2097427,
%U A162573 2099431,8390909,10486243,35652109,134217757,536871089,536873279
%N A162573 Primes of the form 2^x+x*y+2^y, with x and y integers of any sign.
%C A162573 Allowing either sign in x or y leads to fractions 2^x or 2^y if x or y are negative,
%C A162573 but since the sum must be integer, only the case x=y=-1 matters in these quadrants. - _R. J. Mathar_, Jul 31 2007
%t A162573 f[x_,y_]:=2^x+x*y+2^y; lst={};Do[Do[p=f[x,y];If[PrimeQ[p],AppendTo[lst, p]],{y,-5!,6!}],{x,-5!,6!}];Take[Union[lst],5! ]
%K A162573 nonn
%O A162573 1,1
%A A162573 _Vladimir Joseph Stephan Orlovsky_, Jul 06 2009