pyramidal numbers

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pyramidal numbers

[¦pir·ə‚mid·əl ′nəm·bərz]
(mathematics)
The numbers 1, 4, 10, 20, 35, …, which are the number of dots in successive pyramidal arrays and are given by (1/6) n (n + 1) (n + 2), where n = 1, 2, 3, ….
References in periodicals archive ?
n] = Square Pyramidal number of rank n = n(n + 1)(2n + 1)/6
In this paper we consider a figurate sequence of Triangular numbers of dimension 3, also called as Pyramidal numbers.
We can obtain the first k terms of Pyramidal numbers in Maple as;
For constructing Smarandache sequence of Pyramidal numbers we use the operation of concatenation on the terms of the above sequence.
We get the first 20 terms of reversed smarandache sequence of Pyramidal numbers as;