superperfect

Adjective

Meaning

superperfect (not comparable)

(mathematics) Being or relating to a class of positive integers satisfying




σ

2


(
n
)
=
σ
(
σ
(
n
)
)
=
2
n

,


{\displaystyle \sigma ^{2}(n)=\sigma (\sigma (n))=2n\,,}

where σ is the divisor function. They are a generalization of perfect numbers.

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