tetrahedral number

'tetrahedral number' can also refer to...


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An integer of the form ⅙n(n+1)(n+2), where n is a positive integer. This number equals the sum of the first n triangular numbers. The first few tetrahedral numbers are 1, 4, 10 and 20, and the reason for the name can be seen from the figure.

Subjects: Mathematics.

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