freeCodeCamp/curriculum/challenges/spanish/08-coding-interview-prep/project-euler/problem-36-double-base-pali...

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---
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id: 5900f3901000cf542c50fea3
challengeType: 5
title: 'Problem 36: Double-base palindromes'
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videoUrl: ''
localeTitle: 'Problema 36: palíndromos de doble base'
---
## Description
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<section id="description"> El número decimal, 585 = 10010010012 (binario), es palindrómico en ambas bases. Encuentre la suma de todos los números, menos que n, mientras que 1000 &lt;= n &lt;= 1000000, que son palíndromos en la base 10 y en la base 2. (Tenga en cuenta que el número palindrómico, en cualquiera de las bases, puede no incluir ceros a la izquierda). </section>
## Instructions
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<section id="instructions">
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: <code>doubleBasePalindromes(1000)</code> debe devolver 1772.
testString: 'assert(doubleBasePalindromes(1000) == 1772, "<code>doubleBasePalindromes(1000)</code> should return 1772.");'
- text: <code>doubleBasePalindromes(50000)</code> debe devolver 105795.
testString: 'assert(doubleBasePalindromes(50000) == 105795, "<code>doubleBasePalindromes(50000)</code> should return 105795.");'
- text: <code>doubleBasePalindromes(500000)</code> debe devolver 286602.
testString: 'assert(doubleBasePalindromes(500000) == 286602, "<code>doubleBasePalindromes(500000)</code> should return 286602.");'
- text: <code>doubleBasePalindromes(1000000)</code> debe devolver 872187.
testString: 'assert(doubleBasePalindromes(1000000) == 872187, "<code>doubleBasePalindromes(1000000)</code> should return 872187.");'
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='js-seed'>
```js
function doubleBasePalindromes(n) {
// Good luck!
return n;
}
doubleBasePalindromes(1000000);
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```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
</section>