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(Q18451096)
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English
icosihenagonal number
figurate number
21-gonal number
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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
19
n
2
−
17
n
2
{\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
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Wikiquote
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Wikisource
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Wikiversity
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