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 A137185 #10 Dec 13 2019 02:56:12 %S A137185 3,31,73,87,115,129,171,241,283,297,339,367,409,451,535,577,591,619, %T A137185 717,745,787,801,885,927,997,1011,1039,1053,1095,1123,1179,1249,1263, %U A137185 1291,1389,1417,1459,1473,1501,1543,1585,1599,1641,1711,1767,1809,1879,1893,1921 %N A137185 Lucky numbers (A000959) which are congruent to 3 mod 7. %H A137185 Amiram Eldar, <a href="/A137185/b137185.txt">Table of n, a(n) for n = 1..10000</a> %Y A137185 Intersection of A000959 and A017017. %K A137185 nonn %O A137185 1,1 %A A137185 _N. J. A. Sloane_, Mar 07 2008