https://arolstar52-zhtest.hf.space/index.php?action=history&feed=atom&title=218218 - 版本历史2026-07-17T12:33:27Z在这个wiki上该页的修订历史MediaWiki 1.43.9https://arolstar52-zhtest.hf.space/index.php?title=218&diff=255015&oldid=previmported>A2569875：自動計算2022-12-11T12:54:53Z<p>自動計算</p>
<p><b>新页面</b></p><div>{{noteTA|G1=Math}}<br />
{{整数<br />
| 小写 = 二百一十八（二百十八）<br />
| 正因數 = [[1]]，[[2]]，[[109]]，'''218'''<br />
}}<br />
218是在[[217]]和[[219]]之間的[[自然數]]。<br />
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== 性質 ==<br />
{{數字性質|use math=yes}}<br />
*218是[[非歐拉商數]]也是[[非互補歐拉商數]]<ref>{{Cite OEIS|sequencenumber=A058763|name=Integers which are neither totient nor cototient}}</ref><br />
*是首個讓[[梅滕斯函數]]值為3的數<ref>{{Cite OEIS|sequencenumber=A051400|name=Smallest value of x such that M(x)=n, where M() is Mertens's function}}</ref>。<br />
*218是已知最大的[[合數]]n，12^n-1的質因數個數等於n的正因數個數<br />
*218是使用不多於2種顏色為立方體的12條稜上色方式的方法數。若某兩種上色方式可透過旋轉立方體而變為同一種的話則視為重複的上色方式<ref>{{Cite web|url=http://www.math.sjsu.edu/~alperin/CubeColorings.pdf|title=2-Colorings of Cube Edges With 6 Each|quote=Thus there are 218 different 2-colorings of the cube edges|publisher=[[聖荷西州立大學]]|author=Roger C. Alperin|accessdate=2018-10-07|archive-date=2019-07-13|archive-url=https://web.archive.org/web/20190713072747/http://www.math.sjsu.edu/~alperin/CubeColorings.pdf|dead-url=no}}</ref>。<br />
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== 參考文獻 ==<br />
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