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Old 11-28-2000, 04:33 PM
C3 C3 is offline
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Join Date: Jan 2000
Posts: 4,109
Actually, they're not the same thing. The first definition includes three numbers: the number itself, 1, and one other number. So in the example "9", there are two sets of factors, but only 3 numbers (1, 3, 9). With the second definition, there is a possibility of 4 numbers: 1, 3, 11, 33. I guess the first definition is just more restrictive.