is_prime

Oops, try again. Your function fails on is_prime(3). It returns None when it should return True.

not very sure why it doesnt compute when prime is 3, havent been able to solve the problem in days

```
def is_prime(x):
if x > 2:
for n in range(2, x - 1):
if x % n == 0:
return False
else:
return True
elif x == 2:
return True
else:
return False
```