2018-10-10 18:03:03 -04:00
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---
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id: 5900f3fd1000cf542c50ff10
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challengeType: 5
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title: 'Problem 145: How many reversible numbers are there below one-billion?'
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videoUrl: ''
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localeTitle: 问题145：有多少可逆数字低于十亿？
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---
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## Description
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<section id="description">一些正整数n具有sum [n + reverse（n）]完全由奇数（十进制）数字组成的属性。例如，36 + 63 = 99和409 + 904 = 1313.我们将这些数字称为可逆的;所以36,63,409和904是可逆的。 n或反向（n）中不允许前导零。 <p>有一千个可逆数字低于一千。 </p><p>有多少可逆数字低于十亿（109）？ </p></section>
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## Instructions
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<section id="instructions">
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: <code>euler145()</code>应该返回608720。
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2020-02-18 01:40:55 +09:00
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testString: assert.strictEqual(euler145(), 608720);
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2018-10-10 18:03:03 -04:00
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function euler145() {
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// Good luck!
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return true;
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}
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euler145();
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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2020-08-13 17:24:35 +02:00
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/section>
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