freeCodeCamp/curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-447-retractions-c.md

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---
id: 5900f52c1000cf542c51003e
title: 问题447撤回C.
challengeType: 5
videoUrl: ''
---
# --description--
对于每个整数n> 1函数族fnab由fnabx≡ax+ b mod n定义为abx整数和0
对于2≤n≤NFN=ΣRn。 F107≡638042271mod 1 000 000 007
求F1014mod 1 000 000 007
# --hints--
`euler447()`应返回530553372。
```js
assert.strictEqual(euler447(), 530553372);
```
# --solutions--