freeCodeCamp/curriculum/challenges/arabic/08-coding-interview-prep/project-euler/problem-40-champernownes-constant.arabic.md

---
id: 5900f3941000cf542c50fea7
challengeType: 5
title: 'Problem 40: Champernowne"s constant'
videoUrl: ''
localeTitle: ''
---

## Description
undefined

## Instructions
undefined

## Tests
<section id='tests'>

```yml
tests:
  - text: ''
    testString: 'assert.strictEqual(champernownesConstant(100), 5, "<code>champernownesConstant(100)</code> should return 5.");'
  - text: ''
    testString: 'assert.strictEqual(champernownesConstant(1000), 15, "<code>champernownesConstant(1000)</code> should return 15.");'
  - text: ''
    testString: 'assert.strictEqual(champernownesConstant(1000000), 210, "<code>champernownesConstant(1000000)</code> should return 210.");'

```

</section>

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

<div id='js-seed'>

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

champernownesConstant(100);

```

</div>



</section>

## Solution
<section id='solution'>

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