45 lines
		
	
	
		
			828 B
		
	
	
	
		
			Markdown
		
	
	
	
	
	
		
		
			
		
	
	
			45 lines
		
	
	
		
			828 B
		
	
	
	
		
			Markdown
		
	
	
	
	
	
|   | --- | ||
|  | id: 5900f4de1000cf542c50fff1 | ||
|  | title: 'Problem 370: Geometric triangles' | ||
|  | challengeType: 5 | ||
|  | forumTopicId: 302032 | ||
|  | dashedName: problem-370-geometric-triangles | ||
|  | --- | ||
|  | 
 | ||
|  | # --description--
 | ||
|  | 
 | ||
|  | Let us define a geometric triangle as an integer sided triangle with sides a ≤ b ≤ c so that its sides form a geometric progression, i.e. b2 = a · c . | ||
|  | 
 | ||
|  | An example of such a geometric triangle is the triangle with sides a = 144, b = 156 and c = 169. | ||
|  | 
 | ||
|  | There are 861805 geometric triangles with perimeter ≤ 106 . | ||
|  | 
 | ||
|  | How many geometric triangles exist with perimeter ≤ 2.5·1013 ? | ||
|  | 
 | ||
|  | # --hints--
 | ||
|  | 
 | ||
|  | `euler370()` should return 41791929448408. | ||
|  | 
 | ||
|  | ```js | ||
|  | assert.strictEqual(euler370(), 41791929448408); | ||
|  | ``` | ||
|  | 
 | ||
|  | # --seed--
 | ||
|  | 
 | ||
|  | ## --seed-contents--
 | ||
|  | 
 | ||
|  | ```js | ||
|  | function euler370() { | ||
|  | 
 | ||
|  |   return true; | ||
|  | } | ||
|  | 
 | ||
|  | euler370(); | ||
|  | ``` | ||
|  | 
 | ||
|  | # --solutions--
 | ||
|  | 
 | ||
|  | ```js | ||
|  | // solution required | ||
|  | ``` |