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Proper divisor

Revision as of 15:27, 10 May 2021 by Mag1c (talk | contribs) (proper divisors of 1, positive integers)
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A proper divisor of a positive integer $n$ is any divisor of $n$ other than $n$ itself. Thus $1$ has no proper divisors, prime numbers have exactly one proper divisor $1$, and all other positive integers have at least two proper divisors.

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