2*(A056855(n))/(phi(n)*n)
Don Reble
djr at nk.ca
Sat Nov 13 02:47:12 CET 2004
> 2 * (A056855(n)) /(phi(n)*n)
> ...
> 2, 1, 1, 1, 5, 1, 84, 11, ...
> (And this sequence is not in the EIS, but I am submitting the few terms
> above.)
Here's more.
%S Axxxxxx 2,1,1,1,5,1,84,11,184,15,193248,23,19056960,833,33740,64035,
%T Axxxxxx 520105017600,2473,130859579289600,203685,963513600,23748417,
%U Axxxxxx 16397141420298240000,645119,555804546402631680,8527366575
> I asked this question years ago, but is
> 2 * (A056855(n)) /(phi(n)*n)
> always an integer?
>
> I conjecture it is.
Well, the first 5000 terms are integers.
And the conjecture is true whenever N and phi(N)/2 are coprime.
But that leaves much in doubt.
--
Don Reble djr at nk.ca
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