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Define Deficient number
A deficient number is a number n for which the sum of divisors s(n)<2n, the sum of proper divisors s(n) 21 is a Proper divisors are 1, 3 and 7, and their sum is 11. Because 11 is less than 21, the number 21 is deficient. Therefore, its deficiency, 2 x 21 - 32 = 10. 1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 19, 21, 22, 23, 25, 26, 27, 29, 31, 32, 33, 34, 35, 37, 38, 39, 41, 43, 44, 45, 46, 47, 49, 50Example
First 50 Deficient number
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