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freeCodeCamp/curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-304-primonacci.md

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---
id: 5900f49d1000cf542c50ffaf
title: 问题304Primonacci
challengeType: 5
videoUrl: ''
---
# --description--
对于任何正整数n函数next_primen返回最小质数p使得p> n。
序列an定义为 对于n> 1a1= next_prime1014和an= next_primean-1
斐波那契数列fn定义为 对于n> 1f0= 0f1= 1和fn= fn-1+ fn-2
序列bn定义为fan
求出∑bn为1≤n≤100000。 给出答案mod 1234567891011。
# --hints--
`euler304()`应该返回283988410192。
```js
assert.strictEqual(euler304(), 283988410192);
```
# --solutions--