The Collaborative International Dictionary
Pyramidal numbers
Pyramidal \Py*ram`i*dal\, a. [Cf. F. pyramidal.]
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Of or pertaining to a pyramid; in the form of a a pyramid; pyramidical; as, pyramidal cleavage.
The mystic obelisks stand up Triangular, pyramidal.
--Mrs. Browning. -
(Crystallog.) Same as Tetragonal.
Pyramidal numbers (Math.), certain series of figurate numbers expressing the number of balls or points that may be arranged in the form of pyramids. Thus 1, 4, 10, 20, 35, etc., are triangular pyramidal numbers; and 1, 5, 14, 30, 55, etc., are square pyramidal numbers.
Wiktionary
pyramidal numbers
n. (pyramidal number English)