Preferred numbers (Python)

preferred_numbers.py

def preferred_numbers(x, precision = 2):
    """
    >>> preferred_numbers(2)
    [1.0, 3.16]
    >>> preferred_numbers(3)
    [1.0, 2.15, 4.64]
    >>> preferred_numbers(5)
    [1.0, 1.58, 2.51, 3.98, 6.31]
    >>> preferred_numbers(10)
    [1.0, 1.26, 1.58, 2.0, 2.51, 3.16, 3.98, 5.01, 6.31, 7.94]
    
    >>> preferred_numbers(3, 0)
    [1.0, 2.0, 5.0]
    # Like Euro denominations!

    """
    root = 10 ** (1 / x)
    return [round(root ** i, precision) for i in range(x)]