Given an integer, write a function to determine if it is a power of three.

class Solution(object): def isPowerOfThree(self, n): #while (n and (n % 3 == 0)): #n = n / 3 #return n == 1 #return (n > 0 and 1162261467 % n == 0) return (n > 0 and int(math.log10(n) / math.log10(3)) - math.log10(n) / math.log10(3) == 0)