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freeCodeCamp/curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-427-n-sequences.md
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---
id: 5900f5181000cf542c51002a
challengeType: 5
videoUrl: ''
title: 问题427n序列
---
## Description
<section id="description">
整数序列S = {si}如果具有n个元素则每个元素满足1≤si≤n则称为n序列。 因此总共有nn个不同的n序列。
例如序列S = {1、5、5、10、7、7、7、2、3、7}是10个序列。
对于任何序列S令LS为具有相同值的S的最长连续存在的长度。
例如对于上面给定的序列S由于三个连续的7LS= 3。
对于所有n序列S令fn= ∑ LS
例如f3= 45f7= 1403689和f11= 481496895121。
找出f7,500,000mod 1 000 009。
</section>
## Instructions
<section id="instructions">
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: <code>euler427()</code>应该返回97138867。
testString: assert.strictEqual(euler427(), 97138867);
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
function euler427() {
// Good luck!
return true;
}
euler427();
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
/section>