---
id: 5900f44b1000cf542c50ff5e
challengeType: 5
title: 'Problem 223: Almost right-angled triangles I'
---

## Description
<section id='description'>
Let us call an integer sided triangle with sides a ≤ b ≤ c barely acute if the sides satisfy a2 + b2 = c2 + 1.

How many barely acute triangles are there with perimeter ≤ 25,000,000?
</section>

## Instructions
<section id='instructions'>

</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: <code>euler223()</code> should return 61614848.
    testString: assert.strictEqual(euler223(), 61614848, '<code>euler223()</code> should return 61614848.');

```

</section>

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

<div id='js-seed'>

```js
function euler223() {
  // Good luck!
  return true;
}

euler223();
```

</div>



</section>

## Solution
<section id='solution'>

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