static void Main(string[] args)
        {
            Stopwatch sw = Stopwatch.StartNew();
            List<BigInteger> results = new List<BigInteger>();
            object _lock = new object();
            Parallel.For(2,101, i =>
            {
                Parallel.For(2, 101, j =>
                 {
                     BigInteger powResult = BigInteger.Pow(i, j);
                     if (!results.Contains(powResult))
                     {
                         lock (_lock)
                         {
                             results.Add(powResult);
                         }
                     }
                 });
            });
            sw.Stop();
            Console.WriteLine(results.Count);
            Console.WriteLine("Time: " + sw.ElapsedMilliseconds + " ms.");
            Console.Read();
        }