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arXiv 1701.08504math.NT
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实用数的一个推广

A generalization of the practical numbers

Nicholas Schwab, Lola Thompson

摘要:

如果每个$m \leq n$都可以写成$n$的不同约数之和,则正整数$n$是实用的。人们可以通过将算术函数$f$应用于$n$的每个约数,并询问是否给定区间内的所有整数都可以表示为$f(d)$的和,其中$d$是$n$的不同约数,来推广实际数的概念。我们将把这种$n$称为“$f$ -实用”。本文首次引入了$f$ -实用数。我们给出了当所有的$f$ -实用数都可以通过一个简单的充要条件构造时的准则,证明了构造具有任意渐近密度的$f$ -实用集是可能的,并证明了一系列与许多著名算术函数$f$的$f$ -实用数的分布有关的结果.

英文摘要:

A positive integer $n$ is practical if every $m \leq n$ can be written as a sum of distinct divisors of $n$. One can generalize the concept of practical numbers by applying an arithmetic function $f$ to each of the divisors of $n$ and asking whether all integers in a given interval can be expressed as sums of $f(d)$'s, where the $d$'s are distinct divisors of $n$. We will refer to such $n$ as `$f$-practical.' In this paper, we introduce the $f$-practical numbers for the first time. We give criteria for when all $f$-practical numbers can be constructed via a simple necessary-and-sufficient condition, demonstrate that it is possible to construct $f$-practical sets with any asymptotic density, and prove a series of results related to the distribution of $f$-practical numbers for many well-known arithmetic functions $f$.

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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