freeCodeCamp/curriculum/challenges/chinese/08-coding-interview-prep/project-euler/problem-203-squarefree-bino...

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---
id: 5900f4381000cf542c50ff4a
challengeType: 5
title: 'Problem 203: Squarefree Binomial Coefficients'
videoUrl: ''
localeTitle: 问题203无平方二项系数
---
## Description
<section id="description">二项式系数nCk可以以三角形排列Pascal的三角形如下所示 <p> 111121133114641151010511615201561172135352171 ......... </p><p>可以看出Pascal三角形的前八行包含十二个不同的数字1,2,3,4,5,6,7,10,15,20,21和35。 </p><p>如果没有素数的平方除n则正整数n称为squarefree。在Pascal三角形的前八行中的十二个不同数字中除了4和20之外的所有数字都是无方形的。前八行中不同的无平方数字的总和为105。 </p><p>找到Pascal三角形的前51行中不同的无平方数字的总和。 </p></section>
## Instructions
<section id="instructions">
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: <code>euler203()</code>应该返回34029210557338。
testString: 'assert.strictEqual(euler203(), 34029210557338, "<code>euler203()</code> should return 34029210557338.");'
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
function euler203() {
// Good luck!
return true;
}
euler203();
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
</section>