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Deficient numbers

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The deficient numbers are positive integers
n
whose sum of divisors
σ (n)
is less than
2n
(or whose sum of proper divisors
s (n) : σ (n) − n
is less than
n
).

The deficient numbers are listed in A005100. See A125499 for the even deficient numbers and A247328 for the odd deficient numbers.

See also