No subject

[N. J. A. Sloane]

 From conway at math.Princeton.EDU  Fri Nov 20 16:49:08 1998
Return-Path: <conway at math.Princeton.EDU>
Date: Fri, 20 Nov 1998 16:48:08 -0500 (EST)
From: John Conway <conway at math.Princeton.EDU>
To: "N. J. A. Sloane" <njas at research.att.com>
cc: math-fun at optima.CS.Arizona.EDU, eww6n at astsun.astro.virginia.edu,
        njas at research.att.com
Subject: Re: kakmem 56
In-Reply-To: <199811202131.QAA13226 at fry.research.att.com>
Message-ID: <Pine.SUN.3.91.981120164512.22928E-100000 at coffee.princeton.edu>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Status: R



On Fri, 20 Nov 1998, N. J. A. Sloane wrote in response to a posting
abouth "lengths":
 
> The second column is clear:  the greatest mutiplicative
> persistence of any n-digit number (e.g. 0, 77, 679
> have m.p. 0, 4, 5)
> 
> (The persistence of a number is the number of times you need 
> to multiply the digits together before reaching a single digit. 
> E.g. 39->27->14->4 has persistence 3.)

    ... but the table shows some numbers of length 12, whereas
I thought you'd found the maximal possible persistence to be
(almost certainly) 11?

      John Conway