An analogue of the Robin inequality of the second type for odd integers
In this paper we give a variant of the Robin inequality which states that $\frac{σ(n)}{n} \leq \frac{e^γ}{2} \log\log n + \frac{0.7398\cdots}{\log\log n}$ for any odd integer $n \geq 3$.
math.NT↗