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 A025069 #8 May 15 2025 17:21:52 %S A025069 2,3,5,7,16,20,35,43,53,65,86,106,137,153,196,220,246,270,329,353,412, %T A025069 454,521,559,642,686,732,780,869,917,1032,1080,1199,1263,1388,1456, %U A025069 1597,1673,1735,1823,1974,2062,2227,2301,2476,2572,2761 %N A025069 Duplicate of A024377. %K A025069 dead %O A025069 1,1