freeCodeCamp/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-132-large-repunit-factors.english.md

---
id: 5900f3f11000cf542c50ff03
challengeType: 5
title: 'Problem 132: Large repunit factors'
forumTopicId: 301760
---

## Description
<section id='description'>
A number consisting entirely of ones is called a repunit. We shall define R(k) to be a repunit of length k.
For example, R(10) = 1111111111 = 11×41×271×9091, and the sum of these prime factors is 9414.
Find the sum of the first forty prime factors of R(109).
</section>

## Instructions
<section id='instructions'>

</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: <code>euler132()</code> should return 843296.
    testString: assert.strictEqual(euler132(), 843296);

```

</section>

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

<div id='js-seed'>

```js
function euler132() {
  // Good luck!
  return true;
}

euler132();
```

</div>



</section>

## Solution
<section id='solution'>

```js
// solution required
```

</section>