Tetrahedral Number

← Number: Tetrahedral Number | Number: Tetrahedral Number: N² - N / 2 →

Index Entry

Number: Tetrahedral Number: N^2 - N :

N^2 - N : is also the number of balls in a triangular

2

grouping such as that of pool balls grouped for the 'break.'

(Am. Scholar, p. 48)

Citations

1. PLANETARY PLANNING, p. 18, 13 Nov'69