A097407 - OEIS

%I #31 Jan 22 2023 08:42:20

%S 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 105,9728,4,72,11,69273666,2048,18166,1285,3512,3,16657248,4599,3112,

%U 1542,4012472,129,48834,48,518,60787,282224,14,90462791808,81,218,31

%N a(n) = (A097406(n) - 1)/n.

%H Bill McEachen, <a href="/A097407/b097407.txt">Table of n, a(n) for n = 1..1206</a>

%H 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 Cf. A097406, A005420, A186283.

%K nonn

%O 1,3

%A _Marco Matosic_, Aug 16 2004

%E Edited by _Vladeta Jovovic_, Aug 26 2004