What are the first ten triangular numbers?

The first ten triangular numbers are calculated by the formula ( T_n = \frac{n(n + 1)}{2} ), where ( n ) is a positive integer. The first ten triangular numbers are 1, 3, 6, 10, 15, 21, 28, 36, 45, and 55. Each number represents the total number of dots that can form an equilateral triangle with that many rows.