2018-10-10 22:03:03 +00:00
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---
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id: 5900f4621000cf542c50ff74
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challengeType: 5
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videoUrl: ''
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2020-10-01 15:54:21 +00:00
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title: 问题245:Coresilience
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2018-10-10 22:03:03 +00:00
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---
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## Description
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<section id="description">我们将称一个无法取消弹性部分的分数。此外,我们将分母R(d)的弹性定义为具有弹性的适当分数的比率;例如,R(12)= 4/11。 <p>数d> 1的弹性则为φ(d)d-1,其中φ是欧拉的函数。我们进一步定义了n> 1的核心,即C(n)= n - φ(n)n - 1.素数p的核心是C(p)= 1p - 1.找出所有复合整数的总和1 <n≤2×1011,其中C(n)是单位分数。 </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>euler245()</code>应该返回288084712410001。
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2020-02-17 16:40:55 +00:00
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testString: assert.strictEqual(euler245(), 288084712410001);
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2018-10-10 22:03:03 +00:00
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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 euler245() {
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// Good luck!
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return true;
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}
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euler245();
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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 15:24:35 +00:00
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/section>
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