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To have exactly four POSITIVE factors, you need one of these two options:* The first is the cube of a Prime number. The only candidate in this case is 8.

* The product of two different prime numbers: 2 x 3, 2 x 5, 2 x 7 seem to be the only options. 3 x 5 is 15, which is already outside the range you defined.

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7y ago

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