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Additional
deficient number
English Wikipedia - The Free Encyclopedia
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Deficient number
In
number theory
, a
deficient
or
deficient number
is a number
n
for which the sum of divisors
s
(
n
)<2
n
, or, equivalently, the sum of proper divisors (or
aliquot sum
)
s
(
n
)<
n
. The value 2
n
-
s
(
n
) (or
n
-
s
(
n
)) is called the number's
deficiency
.
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