Números superabundantes

Um número $n$ é dito superabundante se ${\frac {\sigma (d)}{d}}<{\frac {\sigma (n)}{n}}$ para qualquer $d<n$ , onde $\sigma (n)$ representa a soma dos divisores de $n$

Referências

Akbary, Amir; Friggstad, Zachary (2009), «Superabundant numbers and the Riemann hypothesis», American Mathematical Monthly, 116 (3): 273–275, doi:10.4169/193009709X470128.
Alaoglu, Leonidas; Erdős, Paul (1944), «On highly composite and similar numbers», American Mathematical Society, Transactions of the American Mathematical Society, 56 (3): 448–469, JSTOR 1990319, doi:10.2307/1990319.

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