---
id: 5900f48f1000cf542c50ffa1
title: 'Problem 290: Digital Signature'
challengeType: 5
forumTopicId: 301942
dashedName: problem-290-digital-signature
---

# --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?

# --hints--

`euler290()` should return 20444710234716470.

```js
assert.strictEqual(euler290(), 20444710234716470);
```

# --seed--

## --seed-contents--

```js
function euler290() {

  return true;
}

euler290();
```

# --solutions--

```js
// solution required
```