Definition:Almost Perfect Number/Definition 1
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Definition
Let $n \in \Z_{\ge 0}$ be a positive integer.
Let $A \left({n}\right)$ denote the abundance of $n$.
$n$ is almost perfect if and only if $A \left({n}\right) = -1$.
Sequence
The sequence of almost perfect numbers begins:
- $1, 2, 4, 8, 16, 32, 64, 128, \ldots$