On Nov 23, 2005, at 6:07 PM, Jim Hurley wrote:


All those numbers are called perfect squares. And only they have an odd number of factors, because one of the factors is the square root of the number in question. For example, nine has three factors, 1 and 9 and 3. [I confess, I can't see how this follows. Jim]


Well, because 9 has four factors -- 1, 3, 3, and 9 -- two of which are assigned to the same chain-puller, who however only pulls the chain once.

Charles

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