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1基本定理介绍我们知道,正整数可以按照因数的个数分成三类:第一类,只有一个数1。第二类,是质数。只含有1和本身两个因数的数叫做质数,质数也称素数。例如,2,3,5,89都是质数。第三类,是合数。除了1和本身以外,还含有其他因数的数叫做合数。合数至少含有三个因数。其中,不同于1和本身的因数又叫做这个合数的真因数。例如,4,6,8,56都是合数,2是4的真因数,2,3是6的真因数。显然,每一个合数都能分解成几个因数的乘积。
1 Introduction to the basic theorem We know that positive integers can be divided into three categories according to the number of factors: the first category, only one number 1. The second category is the prime number. Only contains 1 and two of its own number called the prime number, prime number also known as prime number. For example, 2,3,5,89 are prime numbers. The third category is the composite number. In addition to 1 and itself, but also contains other factors called the composite number. The composite number contains at least three factors. Among them, the factor different from 1 and itself is also called the true factor of this composite number. For example, 4,6,8,56 are all composite numbers, 2 is the true factor of 4, and 2,3 is the true factor of 6. Obviously, every composite number can be broken down into the product of several factors.