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    <title>素数 on Sunday Blog</title>
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      <title>Python 判断素数</title>
      <link>https://blog.sundayhk.com/post/prime-number/</link>
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      <description>求n以内的素数 常规取模优化 只测试 &amp;gt;2 的奇数，因为大于2的质数只可能是奇数 奇数只和一个奇数取模，因为奇数不能被合数整除 找到开方点 [3,int(x**0.5)+1] import datetime start = datetime.datetime.now() n=100000 count=1</description>
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