freeCodeCamp/curriculum/challenges/arabic/08-coding-interview-prep/project-euler/problem-14-longest-collatz-...

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---
id: 5900f37a1000cf542c50fe8d
challengeType: 5
title: 'Problem 14: Longest Collatz sequence'
videoUrl: ''
localeTitle: ''
---
## Description
undefined
## Instructions
undefined
## Tests
<section id='tests'>
```yml
tests:
- text: ''
testString: 'assert.strictEqual(longestCollatzSequence(14), 9, "<code>longestCollatzSequence(14)</code> should return 9.");'
- text: ''
testString: 'assert.strictEqual(longestCollatzSequence(5847), 3711, "<code>longestCollatzSequence(5847)</code> should return 3711.");'
- text: ''
testString: 'assert.strictEqual(longestCollatzSequence(46500), 35655, "<code>longestCollatzSequence(46500)</code> should return 35655.");'
- text: ''
testString: 'assert.strictEqual(longestCollatzSequence(54512), 52527, "<code>longestCollatzSequence(54512)</code> should return 52527.");'
- text: ''
testString: 'assert.strictEqual(longestCollatzSequence(1000000), 837799, "<code>longestCollatzSequence(1000000)</code> should return 837799.");'
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
function longestCollatzSequence(limit) {
// Good luck!
return true;
}
longestCollatzSequence(14);
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
</section>