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Nonlinear exponential twists of the Liouville function

Qingfeng Sun (2011)

Open Mathematics

Let λ(n) be the Liouville function. We find a nontrivial upper bound for the sum X n 2 X λ ( n ) e 2 π i α n , 0 α The main tool we use is Vaughan’s identity for λ(n).

On a question of A. Schinzel: Omega estimates for a special type of arithmetic functions

Manfred Kühleitner, Werner Nowak (2013)

Open Mathematics

The paper deals with lower bounds for the remainder term in asymptotics for a certain class of arithmetic functions. Typically, these are generated by a Dirichlet series of the form ζ 2(s)ζ(2s−1)ζ M(2s)H(s), where M is an arbitrary integer and H(s) has an Euler product which converges absolutely for R s > σ0, with some fixed σ0 < 1/2.

On certain arithmetic functions involving the greatest common divisor

Ekkehard Krätzel, Werner Nowak, László Tóth (2012)

Open Mathematics

The paper deals with asymptotics for a class of arithmetic functions which describe the value distribution of the greatest-common-divisor function. Typically, they are generated by a Dirichlet series whose analytic behavior is determined by the factor ζ2(s)ζ(2s − 1). Furthermore, multivariate generalizations are considered.

On k -free numbers over Beatty sequences

Wei Zhang (2023)

Czechoslovak Mathematical Journal

We consider k -free numbers over Beatty sequences. New results are given. In particular, for a fixed irrational number α > 1 of finite type τ < and any constant ε > 0 , we can show that 1 n x [ α n + β ] 𝒬 k 1 - x ζ ( k ) x k / ( 2 k - 1 ) + ε + x 1 - 1 / ( τ + 1 ) + ε , where 𝒬 k is the set of positive k -free integers and the implied constant depends only on α , ε , k ...

On Linnik's theorem on Goldbach numbers in short intervals and related problems

Alessandro Languasco, Alberto Perelli (1994)

Annales de l'institut Fourier

Linnik proved, assuming the Riemann Hypothesis, that for any ϵ &gt; 0 , the interval [ N , N + log 3 + ϵ N ] contains a number which is the sum of two primes, provided that N is sufficiently large. This has subsequently been improved to the same assertion being valid for the smaller gap C log 2 N , the added new ingredient being Selberg’s estimate for the mean-square of primes in short intervals. Here we give another proof of this sharper result which avoids the use of Selberg’s estimate and is therefore more in the spirit of Linnik’s...

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