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Heptagonal number
Y 90%
polygonal number
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Y 90%
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Wikipedia

A heptagonal number is a figurate number that is constructed by combining heptagons with ascending size. The n-th heptagonal number is given by the formula

Instance of
type of integer
Subclass of
Polygonal number
Follows
Hexagonal number
Followed by
Octagonal number
References
Wikidata