public Dictionary<int,int> FindSeries(string[] v_Patern , string[] v_Array)
        {
            Dictionary<int,int> result=new Dictionary<int,int>();
 
            string s= String.Join("",  v_Array,0,v_Array.Length);
 
            string p= String.Join("",  v_Patern,0,v_Patern.Length);
            string patern="";
            for (int l = 0; l < v_Array.Length; l++)
                patern += p;
            for (int i = 0; i < v_Array.Length; i += v_Patern.Length)
            {
                patern = patern.Substring(0, patern.Length - p.Length);
                if (patern.Length >= 3) // more than 3 occurrances of patern required
                {
                    while (s.IndexOf(patern) != -1)
                    {
                        bool b = true;
                        foreach (KeyValuePair<int, int> d in result)
                            if ((s.IndexOf(patern) > d.Key && s.IndexOf(patern) < d.Key + d.Value))
                                b = false;
                        if (b)
                        {
                            result.Add(s.IndexOf(patern), patern.Length);
                            break;
                        }
                    }
                }
            }
            return result; //return value key: index, value number of occurrances
        }

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            //this only works with numbers in succession
            int[] range = new int[7] { 0, 2, 1, 1, 1, 4, 5 };
            //int[] range = new int[7] { 0, 2, 2, 1, 1, 1, 1 }; 
 
            List<int> tmp = new List<int>();
            tmp.AddRange( range );
 
            foreach (int i in tmp)
            {
                //can be optimised: if 3 found, jump 3 further in list
                Console.WriteLine(i);
                int first = tmp.IndexOf(i);
                int last = tmp.LastIndexOf(i);
                int t = last - first + 1;
                if ( t >= 3 )
                    Console.WriteLine("--> {0} appears {1} times in the list.", i, t);
            }
            Console.ReadKey();
        }
    }
}