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 A137170 #9 Jun 02 2025 00:32:38 %S A137170 3,7,15,31,43,51,63,67,75,79,87,99,111,115,127,135,151,159,163,171, %T A137170 195,211,219,223,231,235,259,267,283,303,307,319,327,331,339,367,391, %U A137170 399,415,427,451,463,475,483,487,495,511,519,535,559,579,583,591,615,619,631,639 %N A137170 Lucky numbers (A000959) which are congruent to 3 mod 4. %H A137170 Amiram Eldar, <a href="/A137170/b137170.txt">Table of n, a(n) for n = 1..10000</a> %Y A137170 Intersection of A000959 and A004767. %K A137170 nonn %O A137170 1,1 %A A137170 _N. J. A. Sloane_, Mar 07 2008