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freeCodeCamp/curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-446-retractions-b.md

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---
id: 5900f52c1000cf542c51003d
title: 问题446撤回B.
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1≤n≤NFN=ΣRn4 + 4。 F1024= 77532377300600。
求F107mod 1 000 000 007
# --hints--
`euler446()`应该返回907803852。
```js
assert.strictEqual(euler446(), 907803852);
```
# --solutions--