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---
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id: 5900f3901000cf542c50fea3
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challengeType: 5
title: 'Problem 36: Double-base palindromes'
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videoUrl: ''
localeTitle: 'Problema 36: palíndromos de doble base'
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---
## 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 < = n < = 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 >
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## Instructions
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< section id = "instructions" >
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< / 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 >