icosihenagonal number (Q18451096)

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figurate number

• 21-gonal number

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Language	Label	Description	Also known as
English	icosihenagonal number	figurate number	21-gonal number

Statements

instance of

type of integer

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subclass of

polygonal number

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follows

icosagonal number

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followed by

icosidigonal number

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defining formula

${\displaystyle {\frac {19n^{2}-17n}{2}}}$

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maintained by WikiProject

WikiProject Mathematics

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Identifiers

Google Knowledge Graph ID

/g/1yp37d8dj

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OEIS ID

A051873

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Sitelinks

Wikipedia(3 entries)

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• emlwiki Nùmer 21-gonèl
• huwiki Huszonegyszögszámok
• svwiki Ikosihenagontal

Wikibooks(0 entries)

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Wikinews(0 entries)

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Wikiquote(0 entries)

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Wikisource(0 entries)

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Wikiversity(0 entries)

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Wikivoyage(0 entries)

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Wiktionary(0 entries)

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Multilingual sites(0 entries)

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