Pentagonal Number Calculator

P(n) = n(3n−1)/2

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About Pentagonal Number Calculator

A pentagonal number calculator computing P(n) = n(3n−1)/2 for both positive and generalized (negative) indices. Key in Euler's pentagonal number theorem for partition function recurrences. Tests if a given number is pentagonal. Client-side.

Pentagonal Number Calculator Features

  • P(n) computation
  • Generalized pentagonal
  • Test membership
  • Euler theorem
  • Sequence

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