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(Q8764)
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subclass of
centered polygonal number
series ordinal
7
follows
centered hexagonal number
followed by
centered octagonal number
0 references
defining formula
C
7
,
n
=
7
2
n
(
n
−
1
)
+
1
=
7
n
2
−
7
n
+
2
2
{\displaystyle {\displaystyle C_{7,n}={\frac {7}{2}}n(n-1)+1={{7n^{2}-7n+2} \over 2}}}
criterion used
centered polygonal number
in defining formula
n
≥
1
,
n
∈
N
{\displaystyle n\geq {1},n\in \mathbb {N} }
0 references
Sitelinks
⧼wikibase-sitelinks-mywikigroup⧽
(0 entries)
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