Pyramidal number

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A pyramidal number is a figurate number that represents a pyramid with a base and a given number of sides. The term is most often used to refer to square pyramidal numbers, which have four sides, but it can also refer to:

Triangular pyramidal number (three sides)
Pentagonal pyramidal number (five sides)
Hexagonal pyramidal number (six sides)
Heptagonal pyramidal number (seven sides)
Octagonal pyramidal number (eight sides)
etc.

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