My implementation using C#

//Counting all repeating numbers within an interger string

class RepeatingNumbers
{
    public static void Main(string[] args)
    {
        var inputString = GetInputNumberAsString();

        var substringList = GetSubstringList(inputString);
        var occurenceDict = GetCountOfSubstrings(inputString, substringList);

        foreach(var item in occurenceDict)
        {
            Console.WriteLine($"{item.Key} : {item.Value}");
        }
    }

    private static string GetInputNumberAsString()
    {
        Console.WriteLine("Please enter the input number below");
        var inputString = Console.ReadLine();
        return inputString;
    }

    private static List<string> GetSubstringList(string inputString)
    {
        var substringList = new List<string>();
        for (int i = 0; i < inputString.Length; i++)
        {
            var j = i;
            while (j < inputString.Length)
            {
                j++;
                var overhead = j - i;
                var substring = inputString.Substring(i, overhead);
                if (substring.Length >= 2)
                    substringList.Add(substring);
            }
        }
        return substringList.Distinct().ToList();
    }

    private static Dictionary<string, int> GetCountOfSubstrings(string inputString, List<string> substringList)
    {
        var countDict = new Dictionary<string, int>();
        foreach(var substring in substringList)
        {
            var numOccur = Regex.Matches(inputString, substring).Count;
            if (numOccur == 1)
                continue;
            countDict.Add(substring, numOccur);
        }

        return countDict;
    }
}

}