freeCodeCamp/curriculum/challenges/arabic/08-coding-interview-prep/project-euler/problem-55-lychrel-numbers....

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---
id: 5900f3a31000cf542c50feb6
challengeType: 5
title: 'Problem 55: Lychrel numbers'
videoUrl: ''
localeTitle: ''
---
## Description
undefined
## Instructions
undefined
## Tests
<section id='tests'>
```yml
tests:
- text: ''
testString: 'assert.strictEqual(countLychrelNumbers(1000), 13, "<code>countLychrelNumbers(1000)</code> should return 13.");'
- text: ''
testString: 'assert.strictEqual(countLychrelNumbers(5000), 76, "<code>countLychrelNumbers(5000)</code> should return 76.");'
- text: ''
testString: 'assert.strictEqual(countLychrelNumbers(10000), 249, "<code>countLychrelNumbers(10000)</code> should return 249.");'
- text: ''
testString: 'assert.strictEqual(countLychrelNumbers(3243), 39, "Your function should count all Lychrel numbers.");'
- text: ''
testString: 'assert.strictEqual(countLychrelNumbers(7654), 140, "Your function should pass all test cases.");'
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
function countLychrelNumbers(num) {
// Good luck!
return true;
}
countLychrelNumbers(10000);
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
</section>