sun3000 Posted August 31, 2020 Posted August 31, 2020 (edited) Prove: $$ \sigma _1 (n) = \sum_{d|n} \varphi(d) \sigma_0 \left( \frac{n}{d} \right)$$ Edited August 31, 2020 by sun3000
HallsofIvy Posted September 3, 2020 Posted September 3, 2020 (edited) It would help if you posted the definitions of "[math]\phi[/math]" and "[math]\sigma_0[/math]" Edited September 3, 2020 by HallsofIvy
Sensei Posted September 3, 2020 Posted September 3, 2020 @HallsofIvy Looks like divisor function: https://en.wikipedia.org/wiki/Divisor_function
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