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pyramidal number
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pyramidal number

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Pyramidal numbers are three-dimensional figurate numbers formed by summing terms from polygonal number series. These numbers are a subdivision of figurate numbers, which were of particular interest to ancient Greek mathematicians like the Pythagoreans. The Pythagoreans visualized numbers as points arranged in geometric shapes, such as triangles (triangular numbers) and squares (square numbers). Polygonal numbers, like triangular and square numbers, can be added together to create these three-dimensional pyramidal sequences.1

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2 Britannica Sources
  1. polygonal number
  2. number game - Polygonal and other figurate numbers

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