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

# --description--

How many integers $0 ≤ n < {10}^{18}$ have the property that the sum of the digits of $n$ equals the sum of digits of $137n$?

# --hints--

`digitalSignature()` should return `20444710234716470`.

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

# --seed--

## --seed-contents--

```js
function digitalSignature() {

  return true;
}

digitalSignature();
```

# --solutions--

```js
// solution required
```