Category:Pyramidal Numbers

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This category contains results about Pyramidal Numbers.
Definitions specific to this category can be found in Definitions/Pyramidal Numbers.

The pyramidal numbers are integers defined as sums of sequences of polygonal numbers as follows.

Let $P \left({k, n}\right)$ be the $n$th $k$-gonal number.

Then the $n$th $k$gonal-based pyramidal number $Y \left({k, n}\right)$ is defined as:

$\displaystyle Y \left({k, n}\right) = \sum_{i \mathop = 1}^n P \left({k, i}\right)$