static void Main(string[] args)
        {
            bool Prime;
            for (double i = 3; i <= 1000000000; i+=2)
            {
                Prime = true;
                for (double j = 3; j <=Math.Sqrt(i); j+=2)
                {
                    if (i % j == 0)
                    {
                        Prime = false;
                        break;
                    }
                }
                if (Prime)
                    Console.Write(i + " ");

            }
        }