On the value distribution of a class of arithmetic functions

Werner Georg Nowak

Displaying similar documents to “On the value distribution of a class of arithmetic functions”

On the Euler function of repdigits

Florian Luca (2008)

Czechoslovak Mathematical Journal

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For a positive integer $n$ we write $φ (n)$ for the Euler function of $n$ . In this note, we show that if $b > 1$ is a fixed positive integer, then the equation $φ (x \frac{b^{n} - 1}{b - 1}) = y \frac{b^{m} - 1}{b - 1}, where x, y \in {1, ..., b - 1},$ has only finitely many positive integer solutions $(x, y, m, n)$ .

On ideals free of large prime factors

Eira J. Scourfield (2004)

Journal de Théorie des Nombres de Bordeaux

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In 1989, E. Saias established an asymptotic formula for $Ψ (x, y) = |\{n \leq x : p ∣ n \Rightarrow p \leq y\}|$ with a very good error term, valid for $exp ({(log log x)}^{(5 / 3) + ϵ}) \leq y \leq x$ , $x \geq x_{0} (ϵ)$ , $ϵ > 0 .$ We extend this result to an algebraic number field $K$ by obtaining an asymptotic formula for the analogous function $Ψ_{K} (x, y)$ with the same error term and valid in the same region. Our main objective is to compare the formulae for $Ψ (x, y)$ and $Ψ_{K} (x, y),$ and in particular to compare the second term in the two expansions.