30








































数表 — 整数


<<
30
31
32
33
34
35
36
37
38
39
>>






<<
0
10
20
30
40
50
60
70
80
90
>>





小写 三十（卅）
大写 叁拾
质因数分解
2×3×5{displaystyle 2times 3times 5}{displaystyle 2times 3times 5}
罗马数字 XXX
二进制 11110
八进制 36
十二进制 26
十六进制 1E

30是29与31之间的自然数。




目录






  • 1 数学性质


  • 2 在科学中


  • 3 在人类文化中


  • 4 在其它领域中


  • 5 参考文献





数学性质



  • 第19個合數，正因數有1、2、3、5、6、10、15和30。前一個為28、下一個為32。

    質因數分解為2×3×5{displaystyle 2times 3times 5}{displaystyle 2times 3times 5}。


  • 第5個過剩數，真因數和為42，盈度為12。前一個為24、下一個為36。
    • 第7個半完全數，和為本身的其中一組因數為1、 3、 5、 6、 15。前一個為28、下一個為36。


  • 第4個佩服數，相減後為本身的因數為6。前一個為24、下一個為40。

  • 第19個無平方數因數的數。前一個為29、下一個為31。

  • 第1個楔形數。下一個為42。

  • 第6個普洛尼克數，為5與6的乘積。前一個為20、下一個為42。

  • 第3個質數階乘，即前3個質數的乘積。前一個為6、下一個為210。

  • 第17個十进制的哈沙德數。前一個為27、下一個為36。

  • 第12個十进制的奢侈數。前一個為28、下一個為33。

  • 正三十邊形為第13個可作圖多邊形。前一個為24、下一個為32。

  • 一對相容數之一（30、40）[1]

  • 質數階乘

  • 屬於有形數

    • 首4個平方数的和

    • 第4個正方錐數




  • 正十二面體和正二十面體都有30條棱

  • 最大的數使得與它互質且比其小之自然數除了1均為素数

  • 第3個十一边形數



在科学中



  • 鋅的原子序數[2]


在人类文化中




  • 陽曆其中4個月的日數為30日，分別為4月、6月、9月及11月


  • 农历中大月的天数


  • 論語中記載孔子自稱「三十而立」


  • 農曆中年三十晚是除夕（农历十二月是小月的年份则在二十九）

  • 飢餓三十


  • NBA、NHL、MLB各有30支球隊。



在其它领域中



参考文献





  1. ^ T. Trotter. Admirable Numbers. （原始内容存档于2010-11-30）. 


  2. ^ Royal Society of Chemistry - Visual Element Periodic Table









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