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 A137196 #10 Dec 13 2019 02:57:08 %S A137196 7,15,31,63,79,87,111,127,135,151,159,223,231,303,319,327,367,391,399, %T A137196 415,463,487,495,511,519,535,559,583,591,615,631,639,655,679,727,735, %U A137196 823,831,855,895,903,927,975,991,1023,1039,1087,1095,1167,1183,1231,1263,1303,1455 %N A137196 Lucky numbers (A000959) which are congruent to 7 mod 8. %H A137196 Amiram Eldar, <a href="/A137196/b137196.txt">Table of n, a(n) for n = 1..10000</a> %Y A137196 Intersection of A000959 and A004771. %K A137196 nonn %O A137196 1,1 %A A137196 _N. J. A. Sloane_, Mar 07 2008