SyntaxError: Invalid syntax in a while loop

[ludegrae]

Thank you very much for the quick awnser and for your code. I'll check it!
Meanwhile I've found the error, it was a parenthesis missing in line 1.
Here is the script

n, i= 1, int(input("Enter a number:"))
while n<=12:
    if n!=12:
        print(i, end=", ")
    else:
        print(i)
    i*=3
    n+=1

It works !

Output:
Enter a number:1
1, 3, 9, 27, 81, 243, 729, 2187, 6561, 19683, 59049, 177147