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 A031158 #8 Nov 15 2019 06:26:54 %S A031158 1,7,13,31,49,67,73,127,133,169,193,235,259,283,319,391,427,475,487, %T A031158 517,535,577,613,619,643,727,739,883,895,925,931,979,991,1009,1021, %U A031158 1039,1093,1105,1201,1231,1249,1261,1387,1417,1471,1495,1501 %N A031158 Twin lucky numbers (lower terms). %H A031158 Amiram Eldar, <a href="/A031158/b031158.txt">Table of n, a(n) for n = 1..10000</a> %Y A031158 Cf. A000959, A031158, A031159, A031160. %K A031158 nonn %O A031158 1,2 %A A031158 _Patrick De Geest_