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 A037940 #8 Aug 11 2024 14:41:31 %S A037940 45,3,3,5,5,67,3,3,3,3,7,17,37,53,239,727,3,41,1949,3411949 %N A037940 Trajectory of 45 under prime factor concatenation procedure. %H A037940 P. De Geest, <a href="https://www.worldofnumbers.com/topic1.htm">Home Primes</a> %Y A037940 Cf. A037273. %K A037940 fini,full,nonn,tabf,base %O A037940 0,1 %A A037940 _Jeff Burch_ %E A037940 Edited by _Charles R Greathouse IV_, Apr 30 2010