56 lines
		
	
	
		
			1.6 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
			
		
		
	
	
			56 lines
		
	
	
		
			1.6 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
| ---
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| id: 5900f53b1000cf542c51004d
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| challengeType: 5
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| title: 'Problem 462: Permutation of 3-smooth numbers'
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| videoUrl: ''
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| localeTitle: 问题462:3个平滑数的排列
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| ---
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| 
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| ## Description
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| <section id="description"> 3平滑数是没有素数因子大于3的整数。对于整数N,我们将S(N)定义为小于或等于N的3平滑数的集合。例如,S(20)= {1,2,3,4,6,8,9,12,16,18}。 <p>我们将F(N)定义为S(N)的排列数,其中每个元素都在其所有适当的除数之后。 </p><p>这是N = 20的可能排列之一。 </p><ul><li> 1,2,4,3,9,8,16,6,18,12。这不是有效的排列,因为12在它的除数6之前出现。 </li><li> 1,2,4,3,9,8,12,16,6,18。 </li></ul><p>我们可以验证F(6)= 5,F(8)= 9,F(20)= 450和F(1000)≈8.8521816557e21。找到F(1018)。给出你的答案,它的科学记数在小数点后四舍五入到十位数。在给出答案时,使用小写e来分隔尾数和指数。例如,如果答案是112,233,445,566,778,899,则答案格式为1.1223344557e17。 </p></section>
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| 
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| ## Instructions
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| <section id="instructions">
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| </section>
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| 
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| ## Tests
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| <section id='tests'>
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| 
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| ```yml
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| tests:
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|   - text: <code>euler462()</code>应返回Infinity。
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|     testString: 'assert.strictEqual(euler462(), Infinity, "<code>euler462()</code> should return Infinity.");'
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| 
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| ```
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| 
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| </section>
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| 
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| ## Challenge Seed
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| <section id='challengeSeed'>
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| 
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| <div id='js-seed'>
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| 
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| ```js
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| function euler462() {
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|   // Good luck!
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|   return true;
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| }
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| 
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| euler462();
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| 
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| ```
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| 
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| </div>
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| 
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| 
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| 
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| </section>
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| 
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| ## Solution
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| <section id='solution'>
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| 
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| ```js
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| // solution required
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| ```
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| </section>
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