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 A031900 #7 Nov 16 2019 03:28:35 %S A031900 171,241,367,433,559,655,699,1339,1369,1545,1675,1839,2001,2095,2221, %T A031900 2283,2527,2607,2671,2697,2797,3055,3363,4045,4413,4465,4521,5235, %U A031900 5259,5719,5737,5851,6031,6061,6093,6123,6177,6211,6253,6505 %N A031900 Lucky numbers with size of gaps equal to 18 (lower terms). %H A031900 Amiram Eldar, <a href="/A031900/b031900.txt">Table of n, a(n) for n = 1..10000</a> %Y A031900 Cf. A000959, A031901. %K A031900 nonn %O A031900 1,1 %A A031900 _Patrick De Geest_