tetrahedral number

noun

A number which results from the summation of consecutive triangular numbers, starting from 1. If the triangular numbers in such a summation are depicted as horizontal triangular arrays of units then these arrays can be stacked vertically to yield a tetrahedral array.

“The nᵗʰ tetrahedral number can be calculated with the formula #123;(n#43;1)³-(n#43;1)#92;over 6#125;.”

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Meanings

nountetrahedral number (plural tetrahedral numbers)

plural tetrahedral numbers

  1. mathematicsA number which results from the summation of consecutive triangular numbers, starting from 1. If the triangular numbers in such a summation are depicted as horizontal triangular arrays of units then these arrays can be stacked vertically to yield a tetrahedral array.

    The nᵗʰ tetrahedral number can be calculated with the formula #123;(n#43;1)³-(n#43;1)#92;over 6#125;.

Cite this entry
APA

tetrahedral number. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/tetrahedral%20number

MLA

“tetrahedral number.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/tetrahedral%20number. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “tetrahedral number,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/tetrahedral%20number.

Source: tetrahedral number on Wiktionary, CC BY-SA 4.0.