(copy of problem 5)

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
Solve

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Last Solution submitted on Nov 30, 2025

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George Berken Riccardo G. 梓斌 Drew

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