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 A031879 #15 Dec 12 2019 07:55:05 %S A031879 1,9,15,21,25,33,49,51,63,69,75,87,93,99,105,111,115,129,133,135,141, %T A031879 159,169,171,189,195,201,205,219,231,235,237,259,261,267,273,285,289, %U A031879 297,303,319,321,327,339,357,361,385,391,393,399,415,427 %N A031879 Nonprime lucky numbers. %H A031879 Amiram Eldar, <a href="/A031879/b031879.txt">Table of n, a(n) for n = 1..10000</a> %Y A031879 Intersection of A000959 and A018252. %Y A031879 Cf. A031157. %K A031879 nonn %O A031879 1,2 %A A031879 _Patrick De Geest_ %E A031879 Name corrected by _Giovanni Resta_, Jun 20 2016