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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>
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<p><strong>示例 1:</strong></p>
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<p><strong>示例 1:</strong></p>
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<pre><strong>输入: </strong>k = 5
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<strong>输出: </strong>9
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<pre>
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<strong>输入:</strong>k = 5
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<strong>输出:</strong>9
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</pre>
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