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What is the smallest positive integer n for which n^2 is divisible by 18 and n^3 is divisible by 640?

 

I thought it was 1, but it was incorrect.

 Mar 19, 2020
 #1
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Try n = 120

 Mar 19, 2020
 #2
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Can I have a reason why?

Guest Mar 19, 2020
 #3
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I simply wrote a simple brute force and ignorance program to find it!

Alan  Mar 19, 2020

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