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Which numbers use only 2's and 5's as prime factors.
The numbers are 3,4,7,8,12,13,15,16,20,25,28,30,36,40,45,and 48.

The ones that are divisible by 10, and not 3. That would be 20 and 40. There are others that use JUST 2's (4,8 and 16) or just 5's (25).

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