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 A191974 #26 Jun 02 2025 04:11:06 %S A191974 1,3,7,13,41,99,239 %N A191974 Erroneous version of A001333. %C A191974 Near the bottom of page 203 in Conway & Guy, it reads: "12 * sqrt(2) = 13 - 0.029437...," but the actual number is more like 16.970563 than 12.970563. In all fairness, however, the correct sequence appears on the very next page. %D A191974 John H. Conway & Richard K. Guy, The Book of Numbers. Copernicus (Springer-Verlag) (1996): 203 - 204 %K A191974 dead %O A191974 1,2 %A A191974 _Alonso del Arte_, Jun 22 2011