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 A169745 #8 Jul 06 2025 17:04:29 %S A169745 0,2,5,11,18,21,23,35,39,44,47,66,69,72,75,81,87,89,95,131,141,147, %T A169745 153,159,165,174,176,179,186,189,191,258,261,264,267,275,278,281,285, %U A169745 291,297,303,315,320,323,329,342,345,347,350,353,359,371,375,380,383,515,546,549,557 %N A169745 Numbers k such that A109671(2*k+1) = 1. %H A169745 N. J. A. Sloane, <a href="/A169745/b169745.txt">Table of n, a(n) for n = 1..9710</a> %Y A169745 Cf. A109671, A169743, A169744, A169746 (first differences). %K A169745 nonn %O A169745 1,2 %A A169745 _N. J. A. Sloane_, May 02 2010