Math Goodies Glossary
Deficient number
In number theory, a deficient number or defective number is a number n for which the sum of divisors (n)', or, equivalently, the sum of proper divisors (or aliquot sum) s(n)
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In number theory, a deficient number or defective number is a number n for which the sum of divisors (n)', or, equivalently, the sum of proper divisors (or aliquot sum) s(n)