66 lines
1.0 KiB
Markdown
66 lines
1.0 KiB
Markdown
---
|
||
id: 5900f5131000cf542c510024
|
||
challengeType: 5
|
||
videoUrl: ''
|
||
title: 问题421:n15 +1的素因子
|
||
---
|
||
|
||
## Description
|
||
<section id="description">
|
||
对于n> 1的每个整数,n15 +1形式的数字是合成的。
|
||
对于正整数n和m,将s(n,m)定义为不超过m的n15 +1个不同素数因子的总和。
|
||
|
||
例如 215 + 1 = 3×3×11×331。
|
||
因此s(2.10)= 3且s(2,1000)= 3 + 11 + 331 = 345。
|
||
|
||
同样是1015 +1 = 7×11×13×211×241×2161×9091。
|
||
因此s(10,100)= 31,而s(10,1000)= 483。
|
||
求出∑ s(n,108)为1≤n≤1011。
|
||
</section>
|
||
|
||
## Instructions
|
||
<section id="instructions">
|
||
</section>
|
||
|
||
## Tests
|
||
<section id='tests'>
|
||
|
||
```yml
|
||
tests:
|
||
- text: <code>euler421()</code>应该返回2304215802083466200。
|
||
testString: assert.strictEqual(euler421(), 2304215802083466200);
|
||
|
||
```
|
||
|
||
</section>
|
||
|
||
## Challenge Seed
|
||
<section id='challengeSeed'>
|
||
|
||
<div id='js-seed'>
|
||
|
||
```js
|
||
function euler421() {
|
||
// Good luck!
|
||
return true;
|
||
}
|
||
|
||
euler421();
|
||
|
||
```
|
||
|
||
</div>
|
||
|
||
|
||
|
||
</section>
|
||
|
||
## Solution
|
||
<section id='solution'>
|
||
|
||
```js
|
||
// solution required
|
||
```
|
||
|
||
/section>
|