freeCodeCamp/curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-171-finding-numbers...

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---
id: 5900f4181000cf542c50ff2a
title: 问题171找到数字的平方和为正方形的数字
challengeType: 5
videoUrl: ''
---
# --description--
对于正整数n令fn为n的数字在基数10中的平方和例如f3= 32 = 9f25= 22 + 52 = 4 + 25 = 29f442= 42 + 42 + 22 = 16 + 16 + 4 = 36找到所有n的总和的最后九位数0 <n <1020使得fn是一个完美的平方。
# --hints--
`euler171()`应该返回142989277。
```js
assert.strictEqual(euler171(), 142989277);
```
# --solutions--