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alchetron.com
Tetrahedral number - Alchetron, The Free Social Encyclopedia
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 is the sum of the first n triangular numbers. The first ten tetrahedral numbers are1, 4, 10, 20, 35, 56, 84,
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