http://demonstrations.wolfram.com/SumOfThreeTriangularNumbers/
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
Triangular numbers are integers of the form (n^2 + n) / 2 ; they are 0, 1, 3, 6, 10, 15, 21, 28, .... As a teenager, in 1796, Gauss proved that every positive integer can be written as the sum of three or fewer triangular numbers.
Contributed by: Ed Pegg Jr
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