tetrahedral number en · NOUN
Meanings
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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;.
Forms
| Spelling | Features | Labels | Source |
|---|---|---|---|
| tetrahedral numbers | Number=Plur | lexicographic |