(Q674928)

Statements

instance of

type of integer

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subclass of

polygonal number

followed by

hexagonal number

follows

square number

series ordinal

5

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image

Pentagonal number.gif
362 × 399; 9 KB

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followed by

hexagonal number

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defining formula

${\displaystyle P_{5,n}={\frac {3n^{2}-n}{2}}}$

criterion used

polygonal number

in defining formula

${\displaystyle n\geq {1},n\in \mathbb {N} }$

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maintained by WikiProject

WikiProject Mathematics

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Commons category

Pentagonal numbers

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Identifiers