Abstract
Let f be any arithmetic function and define Sf(x):=∑n⩽xf([x/n]). When f equals the Euler totient function φ, several authors studied the upper and lower bounds of Sφ(x). In this paper we shall prove that Sφ(x) has an asymptotic formula by the method of exponential sums. This result proves a conjecture proposed by Bordellés, Dai, Heyman, Pan and Shparlinski. Some other asymptotic formulas for arbitrary f are also given in this paper.
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