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 A346609 #7 Aug 16 2021 15:24:56 %S A346609 1,9,15,9,15,25,15,9,15,25,21,9,15,21,25,33,35,39,45,49,45,33,35,45, %T A346609 49,45,49,57,55,57,63,65,63,65,69,75,77,75,77,75,77,85,87,85,87,91,93, %U A346609 95,99,105,111,115,111,105,111,115,105,99,105,115,121,123,125,129,133,135,133,129 %N A346609 The successive odd nonprimes produced during the construction of A203069. %H A346609 N. J. A. Sloane, <a href="/A346609/b346609.txt">Table of n, a(n) for n = 1..10000</a> %Y A346609 Cf. A203069, A346610, A346611. %K A346609 nonn %O A346609 1,2 %A A346609 _Harvey P. Dale_ and _N. J. A. Sloane_, Aug 16 2021