61460c8601
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57 lines
1.1 KiB
Markdown
57 lines
1.1 KiB
Markdown
---
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id: 5900f4be1000cf542c50ffd0
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challengeType: 5
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title: 'Problem 337: Totient Stairstep Sequences'
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videoUrl: ''
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localeTitle: 问题337欧拉序列阶梯
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---
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## Description
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<section id="description">令{a1，a2，...，an}为长度为n的整数序列，使得：a1 = 6，对于所有1≤i<n：φ（ai）<φ（ai + 1）<ai <ai + 11令S（N）为具有≤N的这种序列的数目。例如，S（10）= 4：{6}，{6,8}，{6,8,9}和{6,10}。我们可以验证S（100）= 482073668和S（10 000）mod 108 = 73808307。 <p>找到S（20 000 000）mod 108。 </p><p> 1φ表示欧拉的函数。 </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>euler337()</code>应该返回85068035。
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testString: assert.strictEqual(euler337(), 85068035);
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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 euler337() {
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// Good luck!
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return true;
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}
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euler337();
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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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