---
id: 5900f43a1000cf542c50ff4d
challengeType: 5
title: 'Problem 206: Concealed Square'
videoUrl: ''
localeTitle: 问题206：隐藏的广场
---

## Description
<section id="description">找到唯一的正整数，其正方形的形式为1_2_3_4_5_6_7_8_9_0，其中每个“_”是一个数字。 </section>

## Instructions
<section id="instructions">
</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: <code>euler206()</code>应该返回1389019170。
    testString: 'assert.strictEqual(euler206(), 1389019170, "<code>euler206()</code> should return 1389019170.");'

```

</section>

## Challenge Seed
<section id='challengeSeed'>

<div id='js-seed'>

```js
function euler206() {
  // Good luck!
  return true;
}

euler206();

```

</div>



</section>

## Solution
<section id='solution'>

```js
// solution required
```
</section>