: Mathématiques: heptagonal number

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heptagonal number

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
${\\displaystyle H_{n}={\ rac {5n^{2}-3n}{2}}}$ .

(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Heptagonal_number)

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