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 A031895 #7 Nov 16 2019 03:28:57 %S A031895 63,127,319,463,475,553,613,867,1009,1053,1167,1179,1231,1245,1275, %T A031895 1303,1471,1485,1611,1675,1723,1749,1869,1977,2079,2251,2335,2355, %U A031895 2439,2491,2505,2523,2557,2587,2647,2899,3199,3325,3351,3451,3465 %N A031895 Lucky numbers with size of gaps equal to 12 (upper terms). %H A031895 Amiram Eldar, <a href="/A031895/b031895.txt">Table of n, a(n) for n = 1..10000</a> %Y A031895 Cf. A000959, A031894. %K A031895 nonn %O A031895 1,1 %A A031895 _Patrick De Geest_