Difference between revisions of "Sum of divisors"
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| − | The sum of positive divisors function, $\ | + | The sum of positive divisors function, $\sigma_x$, is defined by |
| − | $$\ | + | $$\sigma_x(n) = \displaystyle\sum_{d|n} d^x,$$ |
where $d|n$ denotes that $d$ is a [[divisor]] of $n$. | where $d|n$ denotes that $d$ is a [[divisor]] of $n$. | ||
Revision as of 21:59, 16 August 2015
The sum of positive divisors function, $\sigma_x$, is defined by $$\sigma_x(n) = \displaystyle\sum_{d|n} d^x,$$ where $d|n$ denotes that $d$ is a divisor of $n$.
