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defective number

noun, Mathematics.

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 of deficient number
First recorded in 1720-30 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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