2018-10-10 18:03:03 -04:00
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---
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id: 5900f50d1000cf542c51001f
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challengeType: 5
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videoUrl: ''
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2020-10-01 17:54:21 +02:00
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title: 问题417：倒数周期II
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2018-10-10 18:03:03 -04:00
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---
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## Description
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<section id="description">单位分数在分子中包含1。给出分母2到10的单位分数的十进制表示： <p> 1/2 = 0.5 1/3 = 0.（3）1/4 = 0.25 1/5 = 0.2 1/6 = 0.1（6）1/7 = 0.（142857）1/8 = 0.125 1/9 = 0.（1）1/10 = 0.1 </p><p>其中0.1（6）表示0.166666 ...，并具有1位循环周期。可以看出1/7具有6位循环周期。 </p><p>分母没有其他素数因子而不是2和/或5的单位分数不被认为具有重复周期。我们将这些单位分数的重复周期的长度定义为0。 </p><p>令L（n）表示1 / n的循环周期的长度。给出ΣL（n）3≤n≤1000 000等于55535191115。 </p><p>找ΣL（n）为3≤n≤100000 000 </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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2020-02-18 01:40:55 +09:00
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- text: <code>euler417()</code>应该返回446572970925740。
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testString: assert.strictEqual(euler417(), 446572970925740);
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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 euler417() {
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// Good luck!
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return true;
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}
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euler417();
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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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