Count number of Odd divisor between given range

using System;

using System.Collections.Generic;

using System.Dynamic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using Newtonsoft.Json;

using System.Data.SqlClient;

namespace ConsoleApp

{

    class Program

    {

        static void Main(string[] args)

        {

            Console.WriteLine("Enter number of iteration");

            int n = Convert.ToInt32(Console.ReadLine());

            for (int i = 0; i < n  ; i++)

            {

                Console.WriteLine("Enter lower bound");

                int a = Convert.ToInt32(Console.ReadLine());

                Console.WriteLine("Enter upper bound");

                int b = Convert.ToInt32(Console.ReadLine());

                int countResult = 0;

                for (int j = a; j <= b; j++)

                {

                    int countEven = 0;

                    for (int k = 1; k <= j; k++)

                    {

                        if (j % k == 0)

                        {

                            countEven = countEven + 1;

                        }

                    }

                    if (countEven % 2 != 0)

                    {

                        countResult = countResult + 1;

                    }

                }

                Console.WriteLine("Number of Interesting number " +  countResult);

            }

            Console.ReadLine();

        }

    }

}