Decagonal number

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

In mathematics, a decagonal number is a figurate number that extends the concept of triangular and square numbers to the decagon (a ten-sided polygon). However, unlike the triangular and square numbers, the patterns involved in the construction of decagonal numbers are not rotationally symmetrical.

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

Image: Kelam, CC BY 4.0, via Wikimedia Commons.