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---
id: 5900f4ef1000cf542c510001
challengeType: 5
title: 'Problem 386: Maximum length of an antichain'
videoUrl: ''
localeTitle: 问题386反链的最大长度
---
## Description
<section id="description">令n为整数Sn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Sn的子集A被称为Sn的反共。 </p><p>例如S30= {1,2,3,5,6,10,15,30} {2,5,6}不是S30的反链。 {2,3,5}是S30的反链。 </p><p>设Nn为Sn的反链的最大长度。 </p><p>找ΣNn为1≤n≤108 </p></section>
## Instructions
<section id="instructions">
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: <code>euler386()</code>应该返回528755790。
testString: 'assert.strictEqual(euler386(), 528755790, "<code>euler386()</code> should return 528755790.");'
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
function euler386() {
// Good luck!
return true;
}
euler386();
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
</section>