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			57 lines
		
	
	
		
			1.1 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
			
		
		
	
	
			57 lines
		
	
	
		
			1.1 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
| ---
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| id: 5900f4e61000cf542c50fff9
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| challengeType: 5
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| title: 'Problem 378: Triangle Triples'
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| videoUrl: ''
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| localeTitle: 问题378:三角形三元组
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| ---
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| 
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| ## Description
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| <section id="description">设T(n)为第n个三角形数,因此T(n)= <p> n(n + 1)2 </p><p> 。 </p><p>设dT(n)为T(n)的除数。例如:T(7)= 28且dT(7)= 6。 </p><p>令Tr(n)为三元组数(i,j,k),使得1≤i<j <k≤n且dT(i)> dT(j)> dT(k)。 Tr(20)= 14,Tr(100)= 5772,Tr(1000)= 11174776。 </p><p>找Tr(60 000 000)。给出答案的最后18位数字。 </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>euler378()</code>应该返回147534623725724700。
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|     testString: assert.strictEqual(euler378(), 147534623725724700);
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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 euler378() {
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|   // Good luck!
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|   return true;
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| }
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| 
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| euler378();
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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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| 
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| /section>
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