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Multiplicative arithmetic function

Divisor sum

{title2=$\sigma_1(n)$}

The sum-of-divisors function is
$$
\sigma_1(n)=\sum_{d\mid n}d.
$$
It is the <divisor sum> of the identity arithmetic function $n\mapsto n$.

Sum-of-divisors function

Past exam of the mathematics course of the University of Cambridge / 2017 / iii / Paper 137 / 3 / a / Solution

Past exam of the mathematics course of the University of Cambridge / 2018 / ii / Paper 3 / 1G / Solution

Sum-of-divisors function ( $σ_{1} (n)$ )

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Sum-of-divisors function (σ1​(n))

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