defective-number

defective number

noun Mathematics.
Dictionary.com Unabridged

deficient number

noun Mathematics.
a positive number that is greater than the sum of all positive integers that are submultiples of it, as 10, which is greater than the sum of 1, 2, and 5.
Also called defective number.


Origin:
1720–30

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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