---
id: 5900f3ab1000cf542c50febe
challengeType: 5
title: 'Problem 63: Powerful digit counts'
videoUrl: ''
localeTitle: 问题63：强大的数字计数
---

## Description
<section id="description"> 5位数字，16807 = 75，也是第五种力量。类似地，9位数字134217728 = 89是第九次幂。存在多少个n位正整数，它们也是n次幂？ </section>

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

## Tests
<section id='tests'>

```yml
tests:
  - text: <code>euler63()</code>应该返回49。
    testString: 'assert.strictEqual(euler63(), 49, "<code>euler63()</code> should return 49.");'

```

</section>

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

<div id='js-seed'>

```js
function euler63() {
  // Good luck!
  return true;
}

euler63();

```

</div>



</section>

## Solution
<section id='solution'>

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