Problem with NestWhileList

• To: mathgroup at smc.vnet.net
• Subject: [mg43673] Problem with NestWhileList
• From: "Robert G. Wilson v" <rgwv at rgwv.com>
• Date: Sun, 28 Sep 2003 06:01:00 -0400 (EDT)
• Organization: The Horse Of Course
• Sender: owner-wri-mathgroup at wolfram.com

```Hello all,

I am working on the function f(x) = 3/2* Ceiling(x) and then counting the number
of iterations beginning with 2n+1 to reach an integer.

Let me give an example. Beginning with 15 -> 45/2 -> 69/2 -> 105/2 -> 159/2 ->
120. This means that it takes 5 'mapping' of the function, f, to reach an integer.
See http://www.research.att.com/projects/OEIS?Anum=A085058

Question, How do I write this? I have tried:
NestWhileList[3Ceiling[#1]/2 &, 15, !IntegerQ, {2, 10}] but all I get is:
{15, 45/2}.

Any help would be greatly appreciated.

Sincerely yours,

Robert G. 'Bob' Wilson, V

```

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