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freeCodeCamp/curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-381-prime-k-factorial.md

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---
id: 5900f4ea1000cf542c50fffc
challengeType: 5
videoUrl: ''
2020-10-01 17:54:21 +02:00
title: 问题381prime-k阶乘
---
## Description
<section id="description">对于素数p令Sp=Σpkmodp1≤k≤5。 <p>例如如果p = 77-1 +7-2 +7-3 +7-4 +7-5 = 6 + 5 + 4 + 3 + 2 = 720 + 120 + 24 + 6 + 2 = 872.当872 mod7= 4时S7= 4。 </p><p>对于5≤p&lt;100可以证实ΣSp= 480。 </p><p>求ΣSp为5≤p&lt;108。 </p></section>
## Instructions
<section id="instructions">
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: <code>euler381()</code>应该返回139602943319822。
testString: assert.strictEqual(euler381(), 139602943319822);
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
function euler381() {
// Good luck!
return true;
}
euler381();
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
/section>