using System;

namespace prime_number
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("3 digit prime numbers starting with 5:");
            for (int i = 500; i < 600; i++)
            {
                if (IsPrime(i))
                {
                    Console.Write(i + "\t");
                }
            }
            Console.ReadLine();
        }

        static bool IsPrime(int number)
        {
            if (number <= 1)
                return false;

            for (int j = 2; j <= Math.Sqrt(number); j++)
            {
                if (number % j == 0)
                    return false;
            }
            return true;
        }
    }
}