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leetcode-cn/problem (Chinese)/第 k 个数 [get-kth-magic-number-lcci].html Normal file
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<p>有些数的素因子只有 3，5，7，请设计一个算法找出第 k 个数。注意，不是必须有这些素因子，而是必须不包含其他的素因子。例如，前几个数按顺序应该是 1，3，5，7，9，15，21。</p>
<p><strong>示例 1:</strong></p>
<pre><strong>输入: </strong>k = 5
<strong>输出: </strong>9
</pre>