freeCodeCamp/curriculum/challenges/arabic/08-coding-interview-prep/project-euler/problem-309-integer-ladders...

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---
id: 5900f4a11000cf542c50ffb4
challengeType: 5
title: 'Problem 309: Integer Ladders'
videoUrl: ''
localeTitle: ''
---
## Description
undefined
## Instructions
undefined
## Tests
<section id='tests'>
```yml
tests:
- text: ''
testString: 'assert.strictEqual(euler309(), 210139, "<code>euler309()</code> should return 210139.");'
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
function euler309() {
// Good luck!
return true;
}
euler309();
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
</section>