>>> from divtri import successio

>>> it = successio(120)
>>> next(it)
120
>>> next(it)
60
>>> next(it)
30
>>> for i in range(15):
...    a = next(it)
>>> next(it)
4
>>> next(it)
2
>>> next(it)
1

>>> it = successio(10)
>>> next(it)
10
>>> next(it)
5
>>> next(it)
16
>>> next(it)
8
>>> next(it)
4
>>> next(it)
2
>>> next(it)
1
>>> next(it)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
StopIteration