def fibonaccigen(f0=0, f1=1):
    """ A000045 [0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, ...]
		arguments are the first two element of the Fibonacci series

		To get a specific Fibonacci number use `fibonacci(n)`.
	"""
    yield f0
    while True:
        yield f1
        f1, f0 = f1 + f0, f1
