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An octagonal number is a type of figurate number that represents a regular octagon. The \( n \)-th octagonal number can be calculated using the formula: \[ O_n = n(3n - 2) \] where \( O_n \) is the \( n \)-th octagonal number and \( n \) is a positive integer (1, 2, 3, ...).

Ancestors (6)

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

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