---
title: Factors of a Mersenne number
id: 598eea87e5cf4b116c3ff81a
challengeType: 5
videoUrl: ''
localeTitle: ''
---

## Description
undefined

## Instructions
undefined

## Tests
<section id='tests'>

```yml
tests:
  - text: ''
    testString: 'assert(typeof check_mersenne === "function", "<code>check_mersenne</code> is a function.");'
  - text: ''
    testString: 'assert(typeof check_mersenne(3) == "string", "<code>check_mersenne(3)</code> should return a string.");'
  - text: ''
    testString: 'assert.equal(check_mersenne(3),"M3 = 2^3-1 is prime","<code>check_mersenne(3)</code> should return "M3 = 2^3-1 is prime".");'
  - text: ''
    testString: 'assert.equal(check_mersenne(23),"M23 = 2^23-1 is composite with factor 47","<code>check_mersenne(23)</code> should return "M23 = 2^23-1 is composite with factor 47".");'
  - text: ''
    testString: 'assert.equal(check_mersenne(929),"M929 = 2^929-1 is composite with factor 13007","<code>check_mersenne(929)</code> should return "M929 = 2^929-1 is composite with factor 13007");'

```

</section>

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

<div id='js-seed'>

```js
function check_mersenne (p) {
  // Good luck!
}

```

</div>



</section>

## Solution
<section id='solution'>

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