[Learning] 3 hours for one simple exercise

[KoFu]

There are some ambiguity (what does mean separated by four) but sum of every forth integer in range n should be simply:

>>> n = 100
>>> sum(i ** 2 for i in range(1, n+1, 4))
80825

Can you help me fix the code implementing range as you told me?
If is not much of a problem...
Thanks!