Definition:Generalized Pentagonal Number/Definition 2/Mistake

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Source Work

1989: Ephraim J. Borowski and Jonathan M. Borwein: Dictionary of Mathematics:

pentagonal number


Mistake

a figurate number of the form $n \paren {3 n \pm 1}$.


Correction

That should in fact be $\dfrac {n \paren {3 n \pm 1} } 2$.


Sources