powers of two in C#

powers_of_two.cs

// Powers of two in C#

static List<long> powers_of_two(int N)
    /*
    This function generates my proposed tactical N sets of numbers made of powers of 2
    and the remaining N-30 numbers will be the last N numbers before 10**9 inclusive.

    As N is always 100, this fuction is always performed without problems
    */
    {
        var A = new List<long>();

        for (double i = 0; i < 30; i++) // Add 30 tattical numbers
        {
            A.Add(Convert.ToInt64(Math.Pow(2, i)));
        }
        for (int i = 0; i < N-30; i++) // Add N-30 ramaining numbers (they can be whatever)
        {
            A.Add(Convert.ToInt64((Math.Pow(10, 9)))-i);
        }
        return A;
    }