---
id: 5900f48f1000cf542c50ffa1
challengeType: 5
videoUrl: ''
title: 问题290：数字签名
---

## Description
<section id="description">

多少个0≤n <1018的整数具有n的位数之和等于137n的位数之和的性质？

</section>

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

## Tests
<section id='tests'>

```yml
tests:
  - text: <code>euler290()</code>应该返回20444710234716470。
    testString: assert.strictEqual(euler290(), 20444710234716470);

```

</section>

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

<div id='js-seed'>

```js
function euler290() {
  // Good luck!
  return true;
}

euler290();

```

</div>



</section>

## Solution
<section id='solution'>

```js
// solution required
```

/section>