freeCodeCamp/curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-193-squarefree-numbers.md

---
id: 5900f42f1000cf542c50ff41
title: 'Problem 193: Squarefree Numbers'
challengeType: 5
forumTopicId: 301831
dashedName: 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?

# --hints--

`euler193()` should return 684465067343069.

```js
assert.strictEqual(euler193(), 684465067343069);
```

# --seed--

## --seed-contents--

```js
function euler193() {

  return true;
}

euler193();
```

# --solutions--

```js
// solution required
```