Back عدد هرمي Arabic Pyramidové číslo Czech Pyramidetal Danish Pyramidenzahl German Nùmer piramidèl EML Piramida nombro Esperanto Nombre pyramidal French Piramisszámok Hungarian Pýramídatala Icelandic Numero piramidale Italian
A pyramidal number is the number of points in a pyramid with a polygonal base and triangular sides.[1] The term often refers to square pyramidal numbers, which have a square base with four sides, but it can also refer to a pyramid with any number of sides.[2] The numbers of points in the base and in layers parallel to the base are given by polygonal numbers of the given number of sides, while the numbers of points in each triangular side is given by a triangular number. It is possible to extend the pyramidal numbers to higher dimensions.
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:0was invoked but never defined (see the help page). - ^ Sloane, N. J. A. (ed.). "Sequence A002414". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.