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 A238443 #111 Sep 09 2023 10:50:42 %S A238443 1,2,4,6,8,12,16,18,20,24,28,30,32,36,40,42,48,54,56,60,64,66,72,80, %T A238443 84,88,90,96,100,104,108,112,120,126,128,132,140,144,150,156,160,162, %U A238443 168,176,180,192,196,198,200,204,208,210,216,220,224,228,234,240,252,256,260 %N A238443 Duplicate of A174973. %K A238443 dead %O A238443 1,2 %A A238443 _Omar E. Pol_, Mar 06 2014