Triangular Number/Examples

Examples of Triangular Numbers
The first few triangular numbers are as follows:

From the definition:
 * $T_0 = 0$


 * [[File:1stTriangleNumber.png]]

The first triangular number: $T_1 = 1$.


 * [[File:2ndTriangleNumber.png]]

The second triangular number: $T_2 = 1 + 2 = 3$.


 * [[File:3rdTriangleNumber.png]]

The third triangular number: $T_3 = 1 + 2 + 3 = 6$.


 * [[File:4thTriangleNumber.png]]

The fourth triangular number: $T_4 = 1 + 2 + 3 + 4 = 10$.


 * [[File:5thTriangleNumber.png]]

The fifth triangular number: $T_5 = 1 + 2 + 3 + 4 + 5 = 15$.