Mean Value from Representation of Rational Number as Sum of Two Egyptian Fractions

Details Mean Value from Representation of Rational Number as Sum of Two Egyptian Fractions Mean Value from Representation of Rational Number as Sum of Two Egyptian Fractions

2011-09-05

arxiv.org/abs/1109.0867v1

Mathematics

Number Theory

Scientific paper

For given positive integers $n$ and $a$, let $R(n;\,a)$ denote the number of positive integer solutions $(x,\,y)$ of the Diophantine equation $$ {a\over n}={1\over x}+{1\over y}. $$ Write $$ S(N;\,a)=\sum_{\substack{n\leq N (n,\,a)=1}}R(n;\,a). $$ Recently Jingjing Huang and R. C. Vaughan proved that for $4\leq N$ and $a\leq 2N$, there is an asymptotic formula $$ S(N;\,a)={3\over \pi^2a}\prod_{p|a}{p-1\over p+1}\cdot N(\log^2N+c_1(a) \log N+c_0(a))+\Delta(N;\,a). $$ In this paper, we shall get a more explicit expression with better error term for $c_0(a)$.

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