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 A031894 #7 Nov 16 2019 03:28:53 %S A031894 51,115,307,451,463,541,601,855,997,1041,1155,1167,1219,1233,1263, %T A031894 1291,1459,1473,1599,1663,1711,1737,1857,1965,2067,2239,2323,2343, %U A031894 2427,2479,2493,2511,2545,2575,2635,2887,3187,3313,3339,3439,3453 %N A031894 Lucky numbers with size of gaps equal to 12 (lower terms). %H A031894 Amiram Eldar, <a href="/A031894/b031894.txt">Table of n, a(n) for n = 1..10000</a> %Y A031894 Cf. A000959, A031895. %K A031894 nonn %O A031894 1,1 %A A031894 _Patrick De Geest_