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Find all positive integers n < 1000 that have exactly five factors.

 Nov 2, 2019
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Any number that can be written as X * X * X * X where is X is a prime number has exactly 5 factors

 

- 2^4 

-3^4

-5^4

-7^4 > 1000... 

 

Your answer would be 3 positive integers. Specifically--2, 3, and 5.

 Nov 2, 2019

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