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arXiv 1207.4841math.NT
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复杂度接近下界的数

Numbers with Integer Complexity Close to the Lower Bound

Harry Altman, Joshua Zelinsky

摘要:

定义$|n|$为$n$的复杂度,使用加法和乘法的任意组合写入$n$所需的最小1个数。约翰·塞尔弗里奇证明了$|n|\ge 3\log_3 n$适用于所有的$n$。定义$n$的缺陷,表示为$δ(n)$,是$|n|-3\log_3 n$,在本文中,我们提出了一种方法来分类所有的$n$与$δ(n)<r$对于一个给定的$r$。由此,我们得出几个结论。我们证明了$|2^m 3^k|=2m+3k$的$m\le 21$与$m$和$k$不都为零,并提出了一种方法,可以用更多的计算,潜在地证明了相同的更大的$m$。此外,定义$A_r(x)$是$n$与$δ(n)<r$和$n\le x$的数量,我们证明了$A_r(x)=Θ_r((\log x)^{\lfloor r \rfloor+1})$,允许我们得出结论,$|n|-3\log_3 n$的值可以是任意大的。

英文摘要:

Define $|n|$ to be the complexity of $n$, the smallest number of 1's needed to write $n$ using an arbitrary combination of addition and multiplication. John Selfridge showed that $|n|\ge 3\log_3 n$ for all $n$. Define the defect of $n$, denoted $δ(n)$, to be $|n|-3\log_3 n$; in this paper we present a method for classifying all $n$ with $δ(n)<r$ for a given $r$. From this, we derive several consequences. We prove that $|2^m 3^k|=2m+3k$ for $m\le 21$ with $m$ and $k$ not both zero, and present a method that can, with more computation, potentially prove the same for larger $m$. Furthermore, defining $A_r(x)$ to be the number of $n$ with $δ(n)<r$ and $n\le x$, we prove that $A_r(x)=Θ_r((\log x)^{\lfloor r \rfloor+1})$, allowing us to conclude that the values of $|n|-3\log_3 n$ can be arbitrarily large.

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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