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 A287642 #37 Jan 22 2025 11:57:46 %S A287642 1,2,3,4,5,6,7,8,10,12,14,16,18,24,30,36,42,48,60,90,210 %N A287642 Duplicate of A141340. %K A287642 dead %O A287642 1,2