Superperfect

English

Etymology

From Template:Prefix, coined by Suryanarayana in 1969.

Pronunciation

• Template:Audio

Adjective

1. Template:Lb Being or relating to a class of positive integers satisfying ${\sigma }^2(n)=\sigma (\sigma (n))=2n,$ where σ is the divisor function. They are a generalization of perfect numbers.