---
id: 5900f4b71000cf542c50ffca
challengeType: 5
title: 'Problem 331: Cross flips'
videoUrl: ''
localeTitle: ''
---

## Description
undefined

## Instructions
undefined

## Tests
<section id='tests'>

```yml
tests:
  - text: ''
    testString: 'assert.strictEqual(euler331(), 467178235146843500, "<code>euler331()</code> should return 467178235146843500.");'

```

</section>

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

<div id='js-seed'>

```js
function euler331() {
  // Good luck!
  return true;
}

euler331();

```

</div>



</section>

## Solution
<section id='solution'>

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