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(Q8767)
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instance of
centered polygonal number
series ordinal
10
follows
centered nonagonal number
0 references
defining formula
C
k
,
n
=
k
2
n
(
n
−
1
)
+
1
=
5
n
2
−
5
n
+
1
{\displaystyle C_{k,n}={\frac {k}{2}}n(n-1)+1=5n^{2}-5n+1}
in defining formula
n
≥
1
,
n
∈
N
{\displaystyle n\geq {1},n\in \mathbb {N} }
criterion used
centered polygonal number
0 references
Sitelinks
⧼wikibase-sitelinks-mywikigroup⧽
(0 entries)
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