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質因子 - Wikipedia

質因子

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數論裡,某一正整數質因子指能整除該數的質數整數。

兩個沒有共同質因子的正整數稱為互質。因為1沒有質因子,1與任何正整數(包括1本身)都是互質。

正整數的因数分解給出一連串的質因子;所有質因子相乘後。質因子如重複會以指數表示。根據算術基本定理,任正整數有獨一無二的質因子分解式。

設任正整數n,其質因子數目及其質因子的和是n的算術函數。

[编辑] 例子

  • 6的質因子是3和2。(6 = 3 × 2)
  • 5只有1個質因子,5本身。(5是質數。)
  • 100有2個質因子:2和5。(100 = 22 × 52)
  • 2、4、8、16等只有1個質因子:2(2是質數,4 = 22,8 = 23,如此類推。)
  • 1沒有質因子。

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