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 A097407 #31 Jan 22 2023 08:42:20 %S A097407 0,1,2,1,6,0,18,2,8,1,8,1,630,3,10,16,7710,1,27594,2,16,31,7760,10,72, %T A097407 105,9728,4,72,11,69273666,2048,18166,1285,3512,3,16657248,4599,3112, %U A097407 1542,4012472,129,48834,48,518,60787,282224,14,90462791808,81,218,31 %N A097407 a(n) = (A097406(n) - 1)/n. %H A097407 Bill McEachen, <a href="/A097407/b097407.txt">Table of n, a(n) for n = 1..1206</a> %H A097407 S. S. Wagstaff, Jr., The Cunningham Project, <a href="http://www.cerias.purdue.edu/homes/ssw/cun/third/pmain901">Factorizations of 2^n-1, n odd, n<1200</a>. %Y A097407 Cf. A097406, A005420, A186283. %K A097407 nonn %O A097407 1,3 %A A097407 _Marco Matosic_, Aug 16 2004 %E A097407 Edited by _Vladeta Jovovic_, Aug 26 2004