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 A132329 #6 Mar 09 2025 12:25:45
%S A132329 1,2,3,4,6,7,8,9,10,11,12,13,14,15,17,18,19,20,22,23,25,26,27,28,29,
%T A132329 30,31,32,33,34,35,36,37,38,39,41,42,43,44,46,47,49,50,51,52,53,54,55,
%U A132329 56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,73,74,75,76,77,78,79,80
%N A132329 Numbers that cannot be expressed as the difference of the squares of primes.
%C A132329 Complement of A124865.
%t A132329 lim=80;sp={4};i=2;Until[Prime[i]^2-(Prime[i]-2)^2>lim,AppendTo[sp,Prime[i]^2];i++];Complement[Range[lim],Union[Differences/@Subsets[sp,{2}]//Flatten]] (* _James C. McMahon_, Mar 08 2025 *)
%Y A132329 Cf. A124865, A090781.
%K A132329 nonn
%O A132329 1,2
%A A132329 _Rick L. Shepherd_, Aug 19 2007