56 lines
		
	
	
		
			1.4 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
			
		
		
	
	
			56 lines
		
	
	
		
			1.4 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
| ---
 | ||
| id: 5900f4831000cf542c50ff95
 | ||
| challengeType: 5
 | ||
| title: 'Problem 278: Linear Combinations of Semiprimes'
 | ||
| videoUrl: ''
 | ||
| localeTitle: 问题278:半正定的线性组合
 | ||
| ---
 | ||
| 
 | ||
| ## Description
 | ||
| <section id="description">给定整数1 <a1 <a2 <... <an的值,考虑线性组合q1a1 + q2a2 + ... + qnan = b,仅使用整数值qk≥0。 <p>注意,对于给定的ak集合,可能不是b的所有值都是可能的。例如,如果a1 = 5且a2 = 7,则没有q1≥0且q2≥0使得b可以是1,2,3,4,6,8,9,11,13,16,18或23 。 </p><p>事实上,23是a1 = 5和a2 = 7的b的最大不可能值。因此,我们称f(5,7)= 23.同样,可以证明f(6,10,15)= 29和f(14,22,77)= 195。 </p><p>找到Σf(p <em>q,p</em> r,q * r),其中p,q和r是素数,p <q <r <5000。 </p></section>
 | ||
| 
 | ||
| ## Instructions
 | ||
| <section id="instructions">
 | ||
| </section>
 | ||
| 
 | ||
| ## Tests
 | ||
| <section id='tests'>
 | ||
| 
 | ||
| ```yml
 | ||
| tests:
 | ||
|   - text: <code>euler278()</code>应该返回1228215747273908500。
 | ||
|     testString: 'assert.strictEqual(euler278(), 1228215747273908500, "<code>euler278()</code> should return 1228215747273908500.");'
 | ||
| 
 | ||
| ```
 | ||
| 
 | ||
| </section>
 | ||
| 
 | ||
| ## Challenge Seed
 | ||
| <section id='challengeSeed'>
 | ||
| 
 | ||
| <div id='js-seed'>
 | ||
| 
 | ||
| ```js
 | ||
| function euler278() {
 | ||
|   // Good luck!
 | ||
|   return true;
 | ||
| }
 | ||
| 
 | ||
| euler278();
 | ||
| 
 | ||
| ```
 | ||
| 
 | ||
| </div>
 | ||
| 
 | ||
| 
 | ||
| 
 | ||
| </section>
 | ||
| 
 | ||
| ## Solution
 | ||
| <section id='solution'>
 | ||
| 
 | ||
| ```js
 | ||
| // solution required
 | ||
| ```
 | ||
| </section>
 |