Centered octagonal number

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Notion

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Science and technology

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What Wikipedia says

A centered octagonal number is a centered figurate number that represents an octagon with a dot in the center and all other dots surrounding the center dot in successive octagonal layers. The centered octagonal numbers are the same as the odd square numbers.

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

Image: Claudio Rocchini, CC BY 2.5, via Wikimedia Commons.