deficient number

American  

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.

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Etymology

Origin of deficient number

First recorded in 1720–30

Example Sentences

This is opposed to a deficient number, as 14, whose aliquot parts are 1, 2, 7, the sum of which is 10; and to a perfect number, which is equal to the sum of its aliquot parts, as 6, whose aliquot parts are 1, 2.,

From Project Gutenberg