56 lines
1.5 KiB
Markdown
56 lines
1.5 KiB
Markdown
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---
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id: 5900f40c1000cf542c50ff1e
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challengeType: 5
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title: 'Problem 159: Digital root sums of factorisations'
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videoUrl: ''
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localeTitle: 问题159：因子的数字根和
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---
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## Description
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<section id="description">复合数可以通过许多不同的方式考虑。例如，不包括乘以一，24可以用7种不同的方式考虑： <p> 24 = 2x2x2x3 24 = 2x3x4 24 = 2x2x6 24 = 4x6 24 = 3x8 24 = 2x12 24 = 24 </p><p>回想一下，基数为10的数字的数字根是通过将该数字的数字加在一起而得到的，并重复该过程，直到到达的数字小于10.因此，467的数字根是8。应将数字根和（DRS）称为我们数字的各个因子的数字根的总和。下图显示了所有DRS值24.因子分解数字根Sum2x2x2x3 92x3x4 92x2x6 104x6 103x8 112x12 524 6 24的最大数字根和为11.函数mdrs（n）给出n的最大数字根和。所以mdrs（24）= 11。找到Σmdrs（n）为1 <n <1,000,000。 </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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- text: <code>euler159()</code>应返回14489159。
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testString: 'assert.strictEqual(euler159(), 14489159, "<code>euler159()</code> should return 14489159.");'
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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 euler159() {
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// Good luck!
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return true;
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}
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euler159();
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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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