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<p>给你一个整数 <code>n</code> ,请你找出并返回第 <code>n</code> 个 <strong>丑数</strong> 。</p>
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2023-12-09 18:42:21 +08:00
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<p><strong>丑数 </strong>就是质因子只包含 <code>2</code>、<code>3</code> 和 <code>5</code> 的正整数。</p>
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2023-12-09 18:42:21 +08:00
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<p> </p>
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<p><strong>示例 1:</strong></p>
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<pre>
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<strong>输入:</strong>n = 10
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<strong>输出:</strong>12
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<strong>解释:</strong>[1, 2, 3, 4, 5, 6, 8, 9, 10, 12] 是由前 10 个丑数组成的序列。
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</pre>
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<p><strong>示例 2:</strong></p>
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<pre>
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<strong>输入:</strong>n = 1
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<strong>输出:</strong>1
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<strong>解释:</strong>1 通常被视为丑数。
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</pre>
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<p> </p>
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<p><strong>提示:</strong></p>
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<ul>
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<li><code>1 <= n <= 1690</code></li>
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</ul>
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