尔冬橙

摘要： A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91* 99.Find the largest palindrome made from the product of two 3-digit numbers.2个两位数相乘得到的最大的回文数是9009，如：9009=91*99。找出2个3位数相乘得到的最大的回文数。static void Main(string[] args) { Int64 i 阅读全文

摘要： The prime factors of 13195 are 5, 7, 13 and 29.What is the largest prime factor of the number 600851475143 ?每个合数都可以写成几个质数相乘的形式。其中每个质数都是这个合数的因数，叫做这个合数的分解质因数。 分解质因数只针对合数。c#代码：class Program { static void Main(string[] args) { Int64 num = 600851475143; int prm = 2;... 阅读全文