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Think of what your `for` loop is doing, specifically at iterations 11 and 12.

```python
for i in range(1,n+2):
	while not g(i):
		i+=1;continue
	a.append(i)
```

In pseudo instructions:

- for-loop iteration 11
  - i = 11
  - while-loop:
    - check not g(i) (i = 11, so it's true)
    - i += 1
    - check not g(i) (i = 12, so it's false)
  - append i (appends 12)

- for-loop iteration 12
  - i = 12
  - while-loop:
    - check not g(i) (i = 12, so it's false)
  - append i (appends 12)

That is, the problem is that as it is written, it is "for `i` from `1` to `n + 2`, *get the smallest Niven number greater than `i`*" which is probably not what you want.

One possible fix to this is just to separate the list index counter and the Niven number counter. The implementation is left as an exercise to the reader.