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	`1`	`+## 题目`
	`2`	`+`
	`3`	`+326. 3的幂`
	`4`	`+`
	`5`	`+给定一个整数,写一个函数来判断它是否是 3 的幂次方。如果是,返回 true ;否则,返回 false 。`
	`6`	`+`
	`7`	`+整数 n 是 3 的幂次方需满足:存在整数 x 使得 n == 3x`
	`8`	`+`
	`9`	`+* 进阶:你能不使用循环或者递归来完成本题吗?`
	`10`	`+`
	`11`	`+## 思路`
	`12`	`+`
	`13`	`+## 代码`
	`14`	`+`
	`15`	+```php
	`16`	`+class Solution {`
	`17`	`+`
	`18`	`+ /**`
	`19`	`+ * @param Integer $n`
	`20`	`+ * @return Boolean`
	`21`	`+ */`
	`22`	`+ function isPowerOfThree($n) {`
	`23`	`+ $a = 1;`
	`24`	`+ while($a <= $n){`
	`25`	`+ if ($a == $n) {`
	`26`	`+ return true;`
	`27`	`+ }`
	`28`	`+ $a *= 3;`
	`29`	`+ }`
	`30`	`+ return false;`
	`31`	`+ }`
	`32`	`+}`
	`33`	+```

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