Related Concepts
Closely related to deficient numbers are perfect numbers with σ(n) = 2n, and abundant numbers with σ(n) > 2n. The natural numbers were first classified as either deficient, perfect or abundant by Nicomachus in his Introductio Arithmetica (circa 100).
Read more about this topic: Deficient Number
Famous quotes containing the words related and/or concepts:
“Gambling is closely related to theft, and lewdness to murder.”
—Chinese proverb.
“When you have broken the reality into concepts you never can reconstruct it in its wholeness.”
—William James (1842–1910)