100以内质数每行5个

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _100以内的质数_一行5个
{
    class Program
    {
        static void Main(string[] args)
        {
            int k=0;
            for (int a = 2; a <= 100; a++)
            {
                if (a == 2 || a == 3 || a == 5 || a == 7)
                {
                
                 Console.Write("{0}{1}", a, ++k % 5 != 0 ? " " : "\r\n");
                }
                else if ((a % 2 == 0 || a % 3 == 0 || a % 5 == 0 || a % 7 == 0) && (a != 2 || a != 3 || a != 5 || a != 7))
                {
                    continue;
                }
                else
                {
                  Console.Write("{0}{1}", a , ++k % 5 != 0 ? " " : "\r\n");
                }
            }Console.ReadKey();
        }

    }
}