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 A137168 #9 Jun 02 2025 00:32:32 %S A137168 1,9,13,21,25,33,37,49,69,73,93,105,129,133,141,169,189,193,201,205, %T A137168 237,241,261,273,285,289,297,321,349,357,361,385,393,409,421,429,433, %U A137168 477,489,517,529,537,541,553,577,601,613,621,645,673,685,693,717,729,741,745,769 %N A137168 Lucky numbers (A000959) which are congruent to 1 mod 4. %H A137168 Amiram Eldar, <a href="/A137168/b137168.txt">Table of n, a(n) for n = 1..10000</a> %Y A137168 Intersection of A000959 and A016813. %K A137168 nonn %O A137168 1,2 %A A137168 _N. J. A. Sloane_, Mar 07 2008