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Note on sums involving the Euler function

By Shane Chern
In this note, we provide refined estimates of the following sums involving the Euler totient function: \(\)\sum_{n\le x} \phi\left(\left[\frac{x}{n}\right]\right) \qquad \text{and} \qquad \sum_{n\le x} \frac{\phi([x/n])}{[x/n]}\(\) where \([x]\) denotes the integral part of real \(x\). The above summations were recently considered by Bordell\`es et al. and Wu.
December 11, 2018
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Note on sums involving the Euler function
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