freeCodeCamp/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-211-divisor-square-...

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---
id: 5900f43f1000cf542c50ff52
challengeType: 5
title: 'Problem 211: Divisor Square Sum'
---
## Description
<section id='description'>
For a positive integer n, let σ2(n) be the sum of the squares of its divisors. For example,
σ2(10) = 1 + 4 + 25 + 100 = 130.
Find the sum of all n, 0 < n < 64,000,000 such that σ2(n) is a perfect square.
</section>
## Instructions
<section id='instructions'>
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: <code>euler211()</code> should return 1922364685.
testString: assert.strictEqual(euler211(), 1922364685, '<code>euler211()</code> should return 1922364685.');
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
function euler211() {
// Good luck!
return true;
}
euler211();
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
</section>