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Old 11-28-2000, 03:59 PM
jeel jeel is offline
Join Date: Oct 2000
Posts: 188
Originally posted by C3
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.
I may have read the first definition a bit wrong. When you say that they are divisible by 1 and "only one" other I get it. But still, I teach algebra at a community college. I have still never heard of Semi-Prime numbers before within our curriculum!