Difference between revisions of "Proper divisor"

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*[[Abundant number]]
 
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*[[2017 USAJMO Problems/Problem 4]]
 
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Revision as of 18:17, 16 April 2018

A proper divisor of a positive integer $n$ is any divisor of $n$ other than $n$ itself. Thus, prime numbers have exactly one proper divisor, 1, and every other number has at least two proper divisors.

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