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 A028750 #7 Jul 08 2025 18:49:21 %S A028750 2,5,6,8,13,14,15,17,18,19,20,22,23,24,29,31,32,35 %N A028750 Nonsquares mod 37. %K A028750 nonn,fini,full %O A028750 1,1 %A A028750 _N. J. A. Sloane_