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Problem 5. Triangle Numbers

Difficulty:Rate

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Solution 789864

Submitted on 7 Dec 2015 by Dale Crawford

Size: 14
Leading solution size is 12.

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1 Comment

1 Comment

Dale Crawford on 7 Dec 2015

I think this works for very low numbers but as you get higher, a work around that might be faster is

n*(n+1)/2

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