Definition:Quasiperfect Number/Definition 3

Definition

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

$n$ is quasiperfect if and only if it is exactly one less than the sum of its aliquot parts.

Also see

• Equivalence of Definitions of Quasiperfect Number

Sources

• 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $16$
• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $16$