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8 October, 22:20

What number between one and 20 has exactly 5 factors

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  1. 8 October, 22:40
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    1,2,4,8,16, these are the factors

    your answer is 16
  2. 8 October, 22:47
    0
    Interesting factoid: Only perfect squares have an odd number of factors. So we know to try 4, 9, and 16, and ignore the rest. It's 16, whose factors are 1, 2, 4, 8, and. 16.
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