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 A137164 #9 Dec 12 2019 07:58:10 %S A137164 3,9,15,21,33,51,63,69,75,87,93,99,105,111,129,135,141,159,171,189, %T A137164 195,201,219,231,237,261,267,273,285,297,303,321,327,339,357,393,399, %U A137164 429,477,483,489,495,519,537,579,591,615,621,639,645,651,693,699,717,723,729,735 %N A137164 Lucky numbers (A000959) which are congruent to 0 mod 3. %H A137164 Amiram Eldar, <a href="/A137164/b137164.txt">Table of n, a(n) for n = 1..10000</a> %Y A137164 Intersection of A000959 and A008585. %K A137164 nonn %O A137164 1,1 %A A137164 _N. J. A. Sloane_, Mar 07 2008