---
id: 5900f46e1000cf542c50ff81
challengeType: 5
title: 'Problem 258: A lagged Fibonacci sequence'
videoUrl: ''
localeTitle: 问题258：滞后的斐波那契序列
---

## Description
<section id="description">序列定义为： <p> gk = 1，对于0≤k≤1999gk = gk-2000 + gk-1999，对于k≥2000。对于k = 1018，找到gk mod 20092010。 </p></section>

## Instructions
<section id="instructions">
</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: <code>euler258()</code>应该返回12747994。
    testString: 'assert.strictEqual(euler258(), 12747994, "<code>euler258()</code> should return 12747994.");'

```

</section>

## Challenge Seed
<section id='challengeSeed'>

<div id='js-seed'>

```js
function euler258() {
  // Good luck!
  return true;
}

euler258();

```

</div>



</section>

## Solution
<section id='solution'>

```js
// solution required
```
</section>