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 A034023 #5 Jul 08 2025 20:02:18 %S A034023 4,8,9,16,18,20,25,32,36,40,45,49,50,52,64,68,72,80,81,90,98,100,104, %T A034023 116,117,121,125,128,136,144,148,153,160,162,164,169,180,196,200,208, %U A034023 212,225,232,234,242,244,245,250,256,260,261,272,288,289 %N A034023 Imprimitively represented by x^2+y^2. %Y A034023 Cf. A001481, A008784, A022544, A034024-. %K A034023 nonn %O A034023 0,1 %A A034023 _N. J. A. Sloane_