1991Illinois Journal of MathematicsRequires access

A note on Ramanujan coefficients of arithmetical functions

Paolo Codecà

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Abstract

In this paper we study a problem related to Ramanujan's expansions of multiplicative functions also considered by H.Delange in 1984.We prove the existence of the mean value of certain arithmetical convolutions and also obtain its integral representation.This gives the possibility of computing immediately the Ramanujan coefficients of the arithmetical functions involved. In this way we obtain a short proof of Delange's theorem.We also obtain a new summability result.

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In this paper we study a problem related to Ramanujan's expansions of multiplicative functions also considered by H.Delange in 1984.We prove the existence of the mean value of certain arithmetical convolutions and also obtain its integral representation.This gives the possibility of computing immediately the Ramanujan coefficients of the arithmetical functions involved. In this way we obtain a short proof of Delange's theorem.We also obtain a new summability result.

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Available abstract

In this paper we study a problem related to Ramanujan's expansions of multiplicative functions also considered by H.Delange in 1984.We prove the existence of the mean value of certain arithmetical convolutions and also obtain its integral representation.This gives the possibility of computing immediately the Ramanujan coefficients of the arithmetical functions involved. In this way we obtain a short proof of Delange's theorem.We also obtain a new summability result.

Key concepts: Arithmetic function, Mathematics, Ramanujan's sum, Pure mathematics, Algebra over a field, Discrete mathematics

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