Centered square number

Rarity: Common

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At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

In elementary number theory, a centered square number is a centered figurate number that gives the number of dots in a square with a dot in the center and all other dots surrounding the center dot in successive square layers.

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

Image: Qalle2, CC BY 4.0, via Wikimedia Commons.