55 lines
980 B
Markdown
55 lines
980 B
Markdown
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---
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id: 5900f5271000cf542c51003a
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challengeType: 5
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title: 'Problem 443: GCD sequence'
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videoUrl: ''
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localeTitle: ''
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---
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## Description
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<section id="description">设g（n）为如下定义的序列：g（4）= 13，g（n）= g（n-1）+ gcd（n，g（n-1）），n> 4。 <p>前几个值是： </p><pre> <code>n4567891011121314151617181920... g(n)1314161718272829303132333451545560...</code> </pre><p>给出g（1 000）= 2524和g（1 000 000）= 2624152。 </p><p>找到g（1015）。 </p></section>
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## Instructions
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undefined
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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: ''
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testString: 'assert.strictEqual(euler443(), 2744233049300770, "<code>euler443()</code> should return 2744233049300770.");'
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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 euler443() {
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// Good luck!
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return true;
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}
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euler443();
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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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</section>
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