Definition:Quasiperfect Number/Definition 2

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Definition

Let $n \in \Z_{\ge 0}$ be a positive integer.


$n$ is quasiperfect if and only if:

$\sigma \left({n}\right) = 2 n + 1$

where $\sigma \left({n}\right)$ denotes the $\sigma$ function of $n$.


Also see