---
id: 5900f48f1000cf542c50ffa1
challengeType: 5
title: 'Problem 290: Digital Signature'
---

## Description
<section id='description'>
How many integers 0 ≤ n < 1018 have the property that the sum of the digits of n equals the sum of digits of 137n?
</section>

## Instructions
<section id='instructions'>

</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: <code>euler290()</code> should return 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>