info prev up next book cdrom email home

Decagonal Number

\begin{figure}\begin{center}\BoxedEPSF{DecagonalNumber.epsf scaled 700}\end{center}\end{figure}

A Figurate Number of the form $4n^2-3n$. The first few are 1, 10, 27, 52, 85, ... (Sloane's A001107). The Generating Function giving the decagonal numbers is



Sloane, N. J. A. Sequence A001107/M4690 in ``An On-Line Version of the Encyclopedia of Integer Sequences.'' and Sloane, N. J. A. and Plouffe, S. The Encyclopedia of Integer Sequences. San Diego: Academic Press, 1995.

© 1996-9 Eric W. Weisstein