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deficient number

noun, Mathematics
1.
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
1720-1730
1720-30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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