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Divisor sum
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Number theory
Multiplicative arithmetic function
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The divisor sum of an arithmetic function
f
is
F
(
n
)
=
∑
d
∣
n
f
(
d
)
.
(2)
If
f
is multiplicative, then
F
is multiplicative as well.
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Multiplicative arithmetic function
Number theory
Area of mathematics
Mathematics
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