Bài tập 53

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

namespace bt_53
{
class Program
{
static void Main(string[] args)
{
int n,i,dem=0;
Console.Write("nhap n="); n = int.Parse(Console.ReadLine());
if (n <= 2)
Console.Write("khong co so nguyen to thoa man de bai");
if (n > 2 && n < 6)
{
Console.Write("so nguyen to la:" + "2\t");
for (i = 1; i < n; i++)
{
for (int j = 2; j <= n / 2; j++)
{
if (i % j != 0 && i > 1)
Console.Write(i);
}
}
}
if (n > 5)
{
Console.Write("cac so nguyen to tu 1 den n la:" + "2\t3\t5\t");
for (i = 1; i < n; i++)
{
for (int j = 2; j <= n / 2; j++)
{
if (i % j != 0 && i % 5 != 0 && i > 1 && i % 2 != 0 && i % 3 != 0)
Console.Write(i + "\t");
dem = dem + 1;
if (dem > 1) break;
}
}
}
Console.ReadKey();
}
}
}