You're right, the maths simplifies it a lot. I rushed out a one-liner without much analysis, and eventually come to the same conclusion.

There's no Range method that takes (start, stop, step) but it's trivial enough to write one, it's a single for loop and yield return statement.

We can even trigger the python users by doing it in one line ;)

    public static class CustomEnumerable { public static IEnumerable<Int32> Range(int start, int stop, int step) {for (int i = start; i < stop; i+=step) yield return i;}}

Try writing your function definitions on one line in python!