tetrahedral number
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English
Noun
tetrahedral number (plural tetrahedral numbers)
- (mathematics) 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 th tetrahedral number can be calculated with the formula .
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