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Old 05-21-2014, 06:31 PM   #265
rushyrulz
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Join Date: Feb 2006
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Age: 31
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Default Re: The Project Euler thread

brute forcing 12 and it's not going so well. I'm almost an hour in and still no solution.
Code:
The sequence of triangle numbers is generated by adding the natural numbers. 
So the 7th triangle number would be 1 + 2 + 3 + 4 + 5 + 6 + 7 = 28. The first ten terms would be:

1, 3, 6, 10, 15, 21, 28, 36, 45, 55, ...

Let us list the factors of the first seven triangle numbers:

 1: 1
 3: 1,3
 6: 1,2,3,6
10: 1,2,5,10
15: 1,3,5,15
21: 1,3,7,21
28: 1,2,4,7,14,28
We can see that 28 is the first triangle number to have over five divisors.

What is the value of the first triangle number to have over five hundred divisors?
In hindsight, I probably would have used a much more efficient factor breakdown algorithm had I known it would take this long.
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Last edited by rushyrulz; 05-21-2014 at 06:34 PM..
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