Problem 5. Triangle Numbers
Triangle numbers are the sums of successive integers. So 6 is a triangle number because
6 = 1 + 2 + 3
which can be displayed in a triangular shape like so
*
* *
* * *
Thus 6 = triangle(3). Given n, return t, the triangular number for n.
Example:
Input n = 4
Output t is 10
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Ian
on 11 Dec 2022
+10 points
Anirban Kar Roy
on 5 Apr 2025
Good question :)
yuyuyu
on 25 Apr 2025
You might know this as the Triangular Number formula—or as some folks call it, the Gauss Summation trick—for adding numbers 1 through n super fast!
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