Centered pentagonal number

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Notion

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Science and technology

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What Wikipedia says

In mathematics, a centered pentagonal number is a centered figurate number that represents a pentagon with a dot in the center and all other dots surrounding the center in successive pentagonal layers. The centered pentagonal number for n is given by the formula

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

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