56 lines
987 B
Markdown
56 lines
987 B
Markdown
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---
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id: 5900f5041000cf542c510016
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challengeType: 5
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title: 'Problem 407: Idempotents'
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videoUrl: ''
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localeTitle: 问题407：幂等元素
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---
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## Description
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<section id="description">如果我们计算a2 mod 6为0≤a≤5，我们得到：0,1,4,3,4,1。 <p> a2≡amod 6的最大值为4.让我们将M（n）称为a <n的最大值，使得a2≡a（mod n）。所以M（6）= 4。 </p><p>找ΣM（n）为1≤n≤107。 </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>euler407()</code>应该返回39782849136421。
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testString: 'assert.strictEqual(euler407(), 39782849136421, "<code>euler407()</code> should return 39782849136421.");'
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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 euler407() {
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// Good luck!
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return true;
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}
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euler407();
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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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