Power of Three

Given an integer n, return true if it is a power of three. Otherwise, return false.

An integer n is a power of three, if there exists an integer x such that n == 3x.

Example 1:

Input: n = 27
Output: true
Explanation: 27 = 33

Example 2:

Input: n = 0
Output: false
Explanation: There is no x where 3x = 0.

Example 3:

Input: n = -1
Output: false
Explanation: There is no x where 3x = (-1).

Solution

class Solution:
    def isPowerOfThree(self, n: int) -> bool:
        x = 1
        while x <= n:
            if x != n:
                x *= 3
            else:
                return True
        return False