Chains.cs

        public static Int32 GetChainLength(Int32 value)
        {
            Func<Int32, Int32> a = n => n / 2;
            Func<Int32, Int32> b = n => 3 * n + 1;

            Int32 chainLength = 1;
            Int32 x = value;
            while(x > 1)
            {
                x = (x > 1 && x % 2 == 0) ? a(x) : b(x);
                chainLength++;
                if (x < 0)
                    return 0;
                if (x == 1)
                    return chainLength;
            }
            return chainLength;
        }