arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1301.5293cs.DSmath.NT
收藏

半光滑整数的近似计数

Approximately counting semismooth integers

Eric Bach, Jonathan Sorenson

摘要:

一个整数$n$是$(y,z)$ -半光滑的,如果$n=pm$,其中$m$是一个整数,所有的素因子$\le y$和$p$是1或一个素数$\le z$。大量的半光滑整数被用在现代整数分解算法中,例如数域筛子(NumberFieldSieve),其结合了所谓的大素数变体。因此,能够估计$Ψ(x,y,z)$的值,即$(y,z)$ -半光滑整数的数量,直到$x$,这对于因子分解从业者是有用的,以便他们可以更好地设置算法参数并最小化运行时间,这在集群超级计算机上可能是几周或几个月。在本文中,我们探讨了几种算法来近似$Ψ(x,y,z)$使用推广的Buchstab的身份与数值积分。

英文摘要:

An integer $n$ is $(y,z)$-semismooth if $n=pm$ where $m$ is an integer with all prime divisors $\le y$ and $p$ is 1 or a prime $\le z$. arge quantities of semismooth integers are utilized in modern integer factoring algorithms, such as the number field sieve, that incorporate the so-called large prime variant. Thus, it is useful for factoring practitioners to be able to estimate the value of $Ψ(x,y,z)$, the number of $(y,z)$-semismooth integers up to $x$, so that they can better set algorithm parameters and minimize running times, which could be weeks or months on a cluster supercomputer. In this paper, we explore several algorithms to approximate $Ψ(x,y,z)$ using a generalization of Buchstab's identity with numeric integration.

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。

↑