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 A034024 #5 Jul 08 2025 20:02:25 %S A034024 4,8,9,16,18,20,32,36,40,45,49,52,64,68,72,80,81,90,98,100,104,116, %T A034024 117,121,128,136,144,148,153,160,162,164,180,196,200,208,212,225,232, %U A034024 234,242,244,245,256,260,261,272,288,292,296,306,320,324,328 %N A034024 Imprimitively but not primitively represented by x^2+y^2. %Y A034024 Cf. A001481, A008784, A022544, A034023-. %K A034024 nonn %O A034024 0,1 %A A034024 _N. J. A. Sloane_