Centered polygonal 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, the centered polygonal numbers are a class of series of figurate numbers, each formed by a central dot, surrounded by polygonal layers of dots with a constant number of sides.

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

Image: Cmglee, CC BY-SA 4.0, via Wikimedia Commons.