freeCodeCamp/curriculum/challenges/spanish/08-coding-interview-prep/project-euler/problem-197-investigating-t...

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---
id: 5
localeTitle: 5900f4311000cf542c50ff44
challengeType: 5
title: 'Problem 197: Investigating the behaviour of a recursively defined sequence'
---
## Description
<section id='description'>
Se da la función f (x) = ⌊230.403243784-x2⌋ × 10-9 (⌊ ⌋ es la función de piso),
la secuencia un está definida por u0 = -1 y un + 1 = f (un).
Encuentre un + un + 1 para n = 1012.
Dé su respuesta con 9 dígitos después del punto decimal.
</section>
## Instructions
<section id='instructions'>
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: <code>euler197()</code> debe devolver 1.710637717.
testString: 'assert.strictEqual(euler197(), 1.710637717, "<code>euler197()</code> should return 1.710637717.");'
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
function euler197() {
// Good luck!
return true;
}
euler197();
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
</section>