什么是prime number and什么叫composite number?

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什么是prime number and什么叫composite number?

什么是prime number and什么叫composite number?
什么是prime number and什么叫composite number?

什么是prime number and什么叫composite number?
prime number = 质数
质数又称素数.指在一个大于1的自然数中,除了1和此整数自身外,没法被其他自然数整除的数.换句话说,只有两个正因数(1和自己)的自然数即为素数.
composite number= 和数
比1大但不是素数的数称为合数.1和0既非素数也非合数.合数是由若干个质数相乘而得到的.所以,质数是合数的基础,没有质数就没有合数.这也说明了前面所提到的质数在数论中有着重要地位.历史上曾将1也包含在质数之内,但后来为了算术基本定理,最终1被数学家排除在质数之外,而从高等代数的角度来看,1是乘法单位元,也不能算在质数之内,并且,所有的合数都可由若干个质数相乘而得到.

prime number质数
composite number合数(至少能被本身和1以外的另一个整数整除的数)

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