freeCodeCamp/curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-442-eleven-free-int...

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---
id: 5900f5271000cf542c510039
title: 问题442十一个整数
challengeType: 5
videoUrl: ''
---
# --description--
如果整数的十进制扩展不包含任何表示11的幂的子串除1之外则称其为十一无码。
例如2404和13431不包含11而911和4121331不是。
令En为第n个正十一无整数。 例如E3= 3E200= 213和E500000= 531563。
找出E1018
# --hints--
`euler442()`应该返回1295552661530920200。
```js
assert.strictEqual(euler442(), 1295552661530920200);
```
# --solutions--