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A number that has exactly an odd number of factors is a power of another number. A number between 10 and 30 that is a power is 16. It is 24 (as well as 42) and its factors are 1, 2, 4, 8, and 16.

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โˆ™ 2010-02-08 07:58:16
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Q: What number has 5 factors exactly between 10 and 30?
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