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freeCodeCamp/curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-248-numbers-for-which-eulers-totient-function-equals-13.md

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---
id: 5900f4651000cf542c50ff77
title: 问题248Euler的totient函数等于13的数字
challengeType: 5
videoUrl: ''
---
# --description--
φn= 13的第一个数字n是6227180929.找到第150,000个这样的数字。
# --hints--
`euler248()`应返回23507044290。
```js
assert.strictEqual(euler248(), 23507044290);
```
# --solutions--