[seqfan] Re: from Steven Finch about A087687

Maximilian Hasler maximilian.hasler at gmail.com
Mon Jan 26 13:39:53 CET 2009


I have 2 suggestions:

* the keywords could be wrapped into a hyperlink to display a short
explanation when the mouse goes over it,
  <a href=# title="This is a multiplicative sequence">mult</a>,
  <a href=# title="This sequence has no negative terms">nonn</a>,
  <a href=# title="This sequence has no terms beyond those listed

* the word "KEYWORD" could also be hyperlinked, to lead to a page of
  <a href="/~njas/sequences/eishelp2.html#RK" title="Click here for
explanation of keywords">keyword</a>

* as I already suggested, it would be nice if the tabf kw could be
linked to the script displaying it properly using the sequence of row
lengths (if available).
  Note that an additional keyword of the form x*** where * is among
0-9A-Za-z could encode a link to A000001-A238329. (Following the tabf
kw, this would be the row lengths).

If you dislike the  blue colour and/or underlined appearence of such
links, it's easy to avoid this via a single line in the global


On Mon, Jan 26, 2009 at 7:49 AM,  <franktaw at netscape.net> wrote:
> Note that A087687 has the "mult" keyword, which says that it is
> multiplicative.
> 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
> is not currently subscribed to the list.
> Olivier
> From: Steven Finch <sfinch9 at hotmail.com>
> Date: Sun, 25 Jan 2009 20:55:11 -0500
> Subject: A087687
> Hello!
> I believe that a(n), as defined by A087687, is a multiplicative
> function.
> 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
> http://algo.inria.fr/bsolve/
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