For faster navigation, this Iframe is preloading the Wikiwand page for 阿喀琉斯数.

阿喀琉斯数

此条目需要扩充。 (2013年2月14日)请协助改善这篇条目,更进一步的信息可能会在讨论页扩充请求中找到。请在扩充条目后将此模板移除。

阿基里斯数(英语:Achilles number)是幂数但不是次方数自然数

定义及名称由来

幂数的英语是powerful number、次方数的英语是perfect power,阿基里斯数即是有能力(powerful)但不完美(perfect)的数。特洛伊战争中的阿基里斯也是有能力但不完美,所以这类数以他的名字命名。

幂数

幂数就是符合“如果素数p是该数的因数,p2就必定是该数的约数”的自然数。简单来说,就是素因数分解式中,各素数的均大于1的数。

次方数

次方数就是能以mk(m是自然数,k是大于1的自然数)表达的数。

例子

288的素因数分解是25×32。它是幂数,但不是次方数,所以是阿基里斯数,360的素因数分解是23×32×5。它不是幂数,所以不是阿基里斯数,784的素因数分解是24×72。(=282)它是次方数,所以不是阿基里斯数。

最小的阿基里斯数

最小的阿基里斯数是72(23×32)。

阿基里斯数列表

72, 108, 200, 288, 392, 432, 500, 648, 675, 800, 864, 968, 972, 1125, 1152, 1323, 1352, 1372, 1568, 1800, 1944, 2000, 2312, 2592, 2700, 2888, 3087, 3200, 3267, 3456, 3528, 3872, 3888, 4000, 4232, 4500, 4563, 4608, 5000, …(OEIS数列A052486

外部链接

関连项目

{{bottomLinkPreText}} {{bottomLinkText}}
阿喀琉斯数
Listen to this article

This browser is not supported by Wikiwand :(
Wikiwand requires a browser with modern capabilities in order to provide you with the best reading experience.
Please download and use one of the following browsers:

This article was just edited, click to reload
This article has been deleted on Wikipedia (Why?)

Back to homepage

Please click Add in the dialog above
Please click Allow in the top-left corner,
then click Install Now in the dialog
Please click Open in the download dialog,
then click Install
Please click the "Downloads" icon in the Safari toolbar, open the first download in the list,
then click Install
{{::$root.activation.text}}

Install Wikiwand

Install on Chrome Install on Firefox
Don't forget to rate us

Tell your friends about Wikiwand!

Gmail Facebook Twitter Link

Enjoying Wikiwand?

Tell your friends and spread the love:
Share on Gmail Share on Facebook Share on Twitter Share on Buffer

Our magic isn't perfect

You can help our automatic cover photo selection by reporting an unsuitable photo.

This photo is visually disturbing This photo is not a good choice

Thank you for helping!


Your input will affect cover photo selection, along with input from other users.

X

Get ready for Wikiwand 2.0 🎉! the new version arrives on September 1st! Don't want to wait?