Tetrahedral number

Rarity: Uncommon

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Notion

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Science and technology

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What Wikipedia says

A tetrahedral number, or triangular pyramidal number, is a figurate number that represents a pyramid with a triangular base and three sides, called a tetrahedron. The nth tetrahedral number, Ten, is the sum of the first n triangular numbers, that is,

Excerpt from the Wikipedia article “Tetrahedral number”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Blotwell, CC BY-SA 3.0, via Wikimedia Commons.