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freeCodeCamp/curriculum/challenges/chinese/08-coding-interview-prep/project-euler/problem-248-numbers-for-which-eulers-totient-function-equals-13.chinese.md

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---
id: 5900f4651000cf542c50ff77
challengeType: 5
title: 'Problem 248: Numbers for which Eulers totient function equals 13!'
videoUrl: ''
localeTitle: 问题248Euler的totient函数等于13的数字
---
## Description
<section id="description"> φn= 13的第一个数字n是6227180929.找到第150,000个这样的数字。 </section>
## Instructions
<section id="instructions">
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: <code>euler248()</code>应返回23507044290。
testString: 'assert.strictEqual(euler248(), 23507044290, "<code>euler248()</code> should return 23507044290.");'
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
function euler248() {
// Good luck!
return true;
}
euler248();
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
</section>