---
id: 5900f42f1000cf542c50ff41
challengeType: 5
title: 'Problem 193: Squarefree Numbers'
---
## Description
A positive integer n is called squarefree, if no square of a prime divides n, thus 1, 2, 3, 5, 6, 7, 10, 11 are squarefree, but not 4, 8, 9, 12.
How many squarefree numbers are there below 250?
## Instructions
## Tests
```yml
tests:
- text: euler193() should return 684465067343069.
testString: assert.strictEqual(euler193(), 684465067343069, 'euler193() should return 684465067343069.');
```
## Challenge Seed
```js
function euler193() {
// Good luck!
return true;
}
euler193();
```