[seqfan] Re: from Steven Finch about A087687

franktaw at netscape.net franktaw at netscape.net
Mon Jan 26 12:49:39 CET 2009

Note that A087687 has the "mult" keyword, which says that it is 

Franklin T. Adams-Watters

-----Original Message-----
From: Olivier Gerard <olivier.gerard at gmail.com>

To seqfan members: if you reply to this message,
please be sure to put Steven Finch in copy, as he
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From: Steven Finch <sfinch9 at hotmail.com>
Date: Sun, 25 Jan 2009 20:55:11 -0500
Subject: A087687


I believe that a(n), as defined by A087687, is a multiplicative 
It seems clear that a(p)=p^2 for any prime p, a(4)=8, a(8)=32 and

a(p^2)=p^2*(p^2+p-1),    a(p^3)=p^4*(p^2+p-1)

for any odd prime.  Formulas for a(p^k) for k>=3 seem to be hard to
find.  Does anyone know how to do this?  Thank you!

Steve Finch

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