Tetrahedral number
Polyhedral number representing a tetrahedron / From Wikipedia, the free encyclopedia
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A tetrahedral number, or triangular pyramidal number, is a figurate number that represents a pyramid with a triangular base and three sides, called a tetrahedron. The nth tetrahedral number, Ten, is the sum of the first n triangular numbers, that is,
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/d/d5/Pyramid_of_35_spheres_animation.gif)
The tetrahedral numbers are: