56 lines
		
	
	
		
			1.4 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
		
		
			
		
	
	
			56 lines
		
	
	
		
			1.4 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
|   | --- | |||
|  | id: 5900f53d1000cf542c51004f | |||
|  | challengeType: 5 | |||
|  | title: 'Problem 464: Möbius function and intervals' | |||
|  | videoUrl: '' | |||
|  | localeTitle: 问题464:莫比乌斯函数和区间 | |||
|  | --- | |||
|  | 
 | |||
|  | ## Description
 | |||
|  | <section id="description"> Möbius函数,表示为μ(n),定义为:μ(n)=( -  1)ω(n),如果n是无平方(其中ω(n)是n的不同素因子的数量)μ(n) )如果n不是无平方,则= 0。 <p>令P(a,b)为区间[a,b]中的整数n,使得μ(n)= 1.设N(a,b)为区间[a,b]中的整数n这样μ(n)= -1。例如,P(2,10)= 2且N(2,10)= 4。 </p><p>令C(n)为整数对(a,b)的数目,使得:1≤a≤b≤n,99·N(a,b)≤100·P(a,b),和99·P( a,b)≤100·N(a,b)。 </p><p>例如,C(10)= 13,C(500)= 16676和C(10000)= 20155319。 </p><p>找C(2 000 000)。 </p></section> | |||
|  | 
 | |||
|  | ## Instructions
 | |||
|  | <section id="instructions"> | |||
|  | </section> | |||
|  | 
 | |||
|  | ## Tests
 | |||
|  | <section id='tests'> | |||
|  | 
 | |||
|  | ```yml | |||
|  | tests: | |||
|  |   - text: <code>euler464()</code>应返回198775297232878。 | |||
|  |     testString: 'assert.strictEqual(euler464(), 198775297232878, "<code>euler464()</code> should return 198775297232878.");' | |||
|  | 
 | |||
|  | ``` | |||
|  | 
 | |||
|  | </section> | |||
|  | 
 | |||
|  | ## Challenge Seed
 | |||
|  | <section id='challengeSeed'> | |||
|  | 
 | |||
|  | <div id='js-seed'> | |||
|  | 
 | |||
|  | ```js | |||
|  | function euler464() { | |||
|  |   // Good luck! | |||
|  |   return true; | |||
|  | } | |||
|  | 
 | |||
|  | euler464(); | |||
|  | 
 | |||
|  | ``` | |||
|  | 
 | |||
|  | </div> | |||
|  | 
 | |||
|  | 
 | |||
|  | 
 | |||
|  | </section> | |||
|  | 
 | |||
|  | ## Solution
 | |||
|  | <section id='solution'> | |||
|  | 
 | |||
|  | ```js | |||
|  | // solution required | |||
|  | ``` | |||
|  | </section> |