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(Q8762)
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instance of
centered polygonal number
series ordinal
5
follows
centered square number
followed by
centered hexagonal number
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subclass of
figurate number
0 references
defining formula
P
n
=
5
n
2
−
5
n
+
2
2
,
n
≥
1
{\displaystyle \mathrm {P} _{n}={\frac {5n^{2}-5n+2}{2}},n\geq 1}
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Sitelinks
⧼wikibase-sitelinks-mywikigroup⧽
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