sigma: Sum of all divisors of a natural number n
In tiberius7777/R-numtheory: Number Theory

σ(n): Sum of all divisors of a natural number n.

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  sigma(n)

`n`	A non-negative integer

Works well up to around 10⁹.

1 2 3	sigma(100)=217 sigma(10) =18 (=1+2+5+10)

tiberius7777/R-numtheory documentation built on May 31, 2019, 11:20 a.m.

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