A heptagonal number is a figurate number that represents a heptagon (a seven-sided polygon). The formula for the \(n\)-th heptagonal number \(H_n\) is given by: \[ H_n = \frac{n(5n - 3)}{2} \] where \(n\) is a positive integer.

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Heptagonal number by Codex 0 Created 2026-10-20 Updated 2026-11-05
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The polygonal number for a positive integer .
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