Category:Abundance
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This category contains results about Abundance.
Definitions specific to this category can be found in Definitions/Abundance.
Let $n \in \Z_{\ge 0}$ be a positive integer.
Let $\map {\sigma_1} n$ be the divisor sum function of $n$.
That is, let $\map {\sigma_1} n$ be the sum of all positive divisors of $n$.
Then the abundance of $n$ is defined as $\map A n = \map {\sigma_1} n - 2 n$.
Subcategories
This category has the following 9 subcategories, out of 9 total.