Tomohiro Yamada
Published 2023-03-29Version 1
We show that if $N\pm 1=M\varphi(N)$, then $M<15.76515\log\log\log N$ and $M<16.03235\log\log\omega(N)$, together with similar results for the unitary totient function, Dedekind function, and the sum of unitary divisors.
An analog of perfect numbers involving the unitary totient function
On the distribution of lcm of k-tuples and related problems
Toward a generalization of Lehmer's problem to adelic curves
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