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---
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id: 5900f48f1000cf542c50ffa1
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challengeType: 5
title: 'Problem 290: Digital Signature'
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videoUrl: ''
localeTitle: 'Problema 290: Firma digital'
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---
## Description
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< section id = "description" > ¿Cuántos enteros 0 ≤ n < 1018 tienen la propiedad de que la suma de los dígitos de n es igual a la suma de los dígitos de 137n? < / 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 > euler290()</ code > debe devolver 20444710234716470.
testString: 'assert.strictEqual(euler290(), 20444710234716470, "< code > euler290()< / code > should return 20444710234716470.");'
```
< / section >
## Challenge Seed
< section id = 'challengeSeed' >
< div id = 'js-seed' >
```js
function euler290() {
// Good luck!
return true;
}
euler290();
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```
< / div >
< / section >
## Solution
< section id = 'solution' >
```js
// solution required
```
< / section >