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freeCodeCamp/curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-421-prime-factors-of-n151.md
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---
id: 5900f5131000cf542c510024
challengeType: 5
videoUrl: ''
title: 问题421n15 +1的素因子
---
## Description
<section id="description">
对于n> 1的每个整数n15 +1形式的数字是合成的。
对于正整数n和m将snm定义为不超过m的n15 +1个不同素数因子的总和。
例如 215 + 1 = 3×3×11×331。
因此s2.10= 3且s2,1000= 3 + 11 + 331 = 345。
同样是1015 +1 = 7×11×13×211×241×2161×9091。
因此s10,100= 31而s10,1000= 483。
求出∑ sn108为1≤n≤1011。
</section>
## Instructions
<section id="instructions">
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: <code>euler421()</code>应该返回2304215802083466200。
testString: assert.strictEqual(euler421(), 2304215802083466200);
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
function euler421() {
// Good luck!
return true;
}
euler421();
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
/section>