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- ...ed in the form of a triangle (Fig. a), while tetrahedral numbers represent numbers arranged in the form of tetrahedra (pyramids) (Fig. b). ...gular numbers are expressed by the formula $[n(n+1)]/2$, while tetrahedral numbers are given by the formula4 KB (566 words) - 07:28, 26 March 2023
- (1)''Use in the theory of figurate numbers'', known about the properties of the numbers in the arithmetical triangle.15 KB (2,384 words) - 06:52, 6 March 2024