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freeCodeCamp/curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-70-totient-permutation.md

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---
id: 5900f3b21000cf542c50fec5
title: 问题70欧拉置换
challengeType: 5
videoUrl: ''
---
# --description--
Euler的Totient函数φn\[有时称为phi函数]用于确定小于或等于n的正数的数量它们是n的相对素数。例如如1,2,4,5,7和8都小于9且相对素数为9φ9= 6.数字1被认为是每个正数的相对素数所以φ1= 1。有趣的是φ87109= 79180可以看出87109是79180的置换。找到n的值1 <n <107其中φn是n的置换和比率n / φn产生最小值。
# --hints--
`euler70()`应该返回8319823。
```js
assert.strictEqual(euler70(), 8319823);
```
# --solutions--