56 lines
1.1 KiB
Markdown
56 lines
1.1 KiB
Markdown
---
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id: 5900f4ef1000cf542c510001
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challengeType: 5
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title: 'Problem 386: Maximum length of an antichain'
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videoUrl: ''
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localeTitle: 问题386:反链的最大长度
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---
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## Description
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<section id="description">令n为整数,S(n)为n的因子集。 <p>如果A仅包含一个元素,或者如果A的元素中没有一个除以A的任何其他元素,则S(n)的子集A被称为S(n)的反共。 </p><p>例如:S(30)= {1,2,3,5,6,10,15,30} {2,5,6}不是S(30)的反链。 {2,3,5}是S(30)的反链。 </p><p>设N(n)为S(n)的反链的最大长度。 </p><p>找ΣN(n)为1≤n≤108 </p></section>
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## Instructions
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<section id="instructions">
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: <code>euler386()</code>应该返回528755790。
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testString: 'assert.strictEqual(euler386(), 528755790, "<code>euler386()</code> should return 528755790.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function euler386() {
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// Good luck!
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return true;
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}
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euler386();
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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