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Hi!

I'm new at python and I don't get the while statement. I'm trying to make a simple function that returns each term of a geometric progression 'til 'n'.

```
def gp(a1,r,n):
while not n == 0:
n = n - 1
an = a1 * (r ** n)
return an
```

For gp(3,3,3)

It should return:

27

9

3

But it returns

27

It always returns the last (n=n-1) term of the GP.