Sum of divisors
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Revision as of 11:56, 19 January 2015 by Tom (talk | contribs) (Tom moved page Sum of positive divisors function to Sum of divisors)
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 $n$.
