//The prime factors of 13195 are 5, 7, 13 and 29.

        //What is the largest prime factor of the number 600851475143 ?

        static void Main(string[] args)

        {

            //int[] number = new int[100];

            long[] number = new long[1228];                  //通过count计数得到容器一共收录1228个long型数据

            ArrayList list = new ArrayList();

            //int count = 0;

            for (int i = 3; i < 10000; i++)

            {

                int index = -1;

                for (int j = 2; j < i; j++)

                {

                    if (i % j != 0 && i != j)

                    {

                    }

                    else                     {                         index += 1;                     }                 }                 if (index == -1)                 {                     list.Add(i);                     //Console.WriteLine(i);                     //count += 1;                 }             }             long num = 0;             for (int i = 0; i < 1228; i++)             {                 string str = list[i].ToString();                 num = long.Parse(str);                 //Console.WriteLine(num);                 number[i] = num;             }             //Console.WriteLine(count);                  //以上均为计算10000以内的所有的所有质数代码

            //int max = 13195;

            long max = 600851475143;             for (int i = 0; i < 1228; i++)             {                 if (max % number[i] == 0)                 {                     Console.WriteLine(number[i]);                     max = max / number[i];               //如果该值除以某质数余数为0，则进行除法运算更换该值

                }

            }         }