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
Solution Stats
Problem Comments
-
26 Comments
Show
23 older comments
Ian
on 11 Dec 2022
+10 points
Anirban Kar Roy
on 5 Apr 2025 at 8:57
Good question :)
yuyuyu
on 25 Apr 2025 at 11:25
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!
Solution Comments
Show commentsProblem Recent Solvers28590
Suggested Problems
-
4125 Solvers
-
Back to basics 11 - Max Integer
793 Solvers
-
Convert a numerical matrix into a cell array of strings
2130 Solvers
-
795 Solvers
-
Determine the number of odd integers in a vector
761 Solvers
More from this Author96
Problem Tags
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!