Difference between revisions of "Sum of divisors"
From specialfunctionswiki
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$$\sigma_x(n) = \displaystyle\sum_{d|n} d^x,$$ | $$\sigma_x(n) = \displaystyle\sum_{d|n} d^x,$$ | ||
where $d|n$ denotes that $d$ is a [[divisor]] of $n$. | where $d|n$ denotes that $d$ is a [[divisor]] of $n$. | ||
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| + | [[Category:SpecialFunction]] | ||
Revision as of 18:49, 24 May 2016
The sum of positive divisors function, $\sigma_x$, is defined by $$\sigma_x(n) = \displaystyle\sum_{d|n} d^x,$$ where $d|n$ denotes that $d$ is a divisor of $n$.
