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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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  1. Figurate numbers
  2. Numbers
  3. Arithmetic
  4. Fields of mathematics
  5. Mathematics
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