---
id: 5900f44b1000cf542c50ff5e
challengeType: 5
title: 'Problem 223: Almost right-angled triangles I'
---
## 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?
## Instructions
## Tests
```yml
tests:
- text: euler223() should return 61614848.
testString: assert.strictEqual(euler223(), 61614848, 'euler223() should return 61614848.');
```
## Challenge Seed
```js
function euler223() {
// Good luck!
return true;
}
euler223();
```