arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1306.4891math.NT
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互素集、Divisor和与部分和

Relatively Prime Sets, Divisor Sums, and Partial Sums

Prapanpong Pongsriiam

摘要:

对于正整数的非空有限集$A$,设$\gcd\left(A\right)$表示$A$中元素的最大公约数。令$f\left(n\right)$和$Φ\left(n\right)$分别表示使得$\gcd\left(A\right) = 1$的$\left\{1, 2, \ldots, n\right\}$的子集$A$的数目和使得$\gcd\left(A\cup\left\{n\right\}\right) =1$的$\left\{1, 2, \ldots, n\right\}$的子集$A$的数目。令$D\left(n\right)$是$f\left(n\right)$的除数和。本文得到了$f\left(n\right)$,$Φ\left(n\right)$和$D\left(n\right)$的部分和.我们还得到了$D\left(n\right)$的组合解释和同余性质。在本文的最后,我们给出了有关$Φ\left(n\right)$和$D\left(n\right)$的开放性问题。

英文摘要:

For a nonempty finite set $A$ of positive integers, let $\gcd\left(A\right)$ denote the greatest common divisor of the elements of $A$. Let $f\left(n\right)$ and $Φ\left(n\right)$ denote, respectively, the number of subsets $A$ of $\left\{1, 2, \ldots, n\right\}$ such that $\gcd\left(A\right) = 1$ and the number of subsets $A$ of $\left\{1, 2, \ldots, n\right\}$ such that $\gcd\left(A\cup\left\{n\right\}\right) =1$. Let $D\left(n\right)$ be the divisor sum of $f\left(n\right)$. In this article, we obtain partial sums of $f\left(n\right)$, $Φ\left(n\right)$ and $D\left(n\right)$. We also obtain a combinatorial interpretation and a congruence property of $D\left(n\right)$. We give open questions concerning $Φ\left(n\right)$ and $D\left(n\right)$ at the end of this article.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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