[seqfan] Re: Sequence A139400

Richard Guy rkg at cpsc.ucalgary.ca
Tue Feb 3 15:51:34 CET 2009

      Have managed to contact Paul Raff.
He is sending corrections. He also has
40 terms, which I think you'd like.  It
is almost certainly a divisibility sequence
(this may follow from its combinatorial
origin, without need for an algebraic
proof).  It's immediately apparent that
the prime 5 has at least four ranks of
apparition (2, 3, 5, 13) and I hope to find
an example with five.   R.

On Mon, 2 Feb 2009, N. J. A. Sloane wrote:

> Richard,  why not ask Paul Raff directly?  (and of course tell
> me if any corrections are needed!)
> His email address is given in that entry - praff at math.rutgers.edu -
> he is certainly around and will surely straighten this out!
> Best regards
> 			 Neil
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