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 A031901 #7 Nov 16 2019 03:28:38 %S A031901 189,259,385,451,577,673,717,1357,1387,1563,1693,1857,2019,2113,2239, %T A031901 2301,2545,2625,2689,2715,2815,3073,3381,4063,4431,4483,4539,5253, %U A031901 5277,5737,5755,5869,6049,6079,6111,6141,6195,6229,6271,6523 %N A031901 Lucky numbers with size of gaps equal to 18 (upper terms). %H A031901 Amiram Eldar, <a href="/A031901/b031901.txt">Table of n, a(n) for n = 1..10000</a> %Y A031901 Cf. A000959, A031900. %K A031901 nonn %O A031901 1,1 %A A031901 _Patrick De Geest_