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The number 6 has exactly four positive divisors: 1, 2, 3 and 6. What is the
the smallest positive integer that has exactly five divisors?

 Apr 11, 2020
 #1
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16 = (1, 2, 4, 8, 16) = 5 (divisors)

 Apr 11, 2020
 #2
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To extend Guest's answer ... to have an odd number of divisors, the number must be a perfect square.

 Apr 11, 2020

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