Chükö

deficient numbers

A deficient number is a positive integer that is greater than the sum of its proper divisors.

The first few deficient numbers are: 2, 3, 4, 5, 7, 8, 9, 10, 11, 13, 14, …

752,451 of the first one million positive integers are deficient.

Learn more about deficient numbers on wikipedia.

See other features.