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Proofs Without Words

A Centered Polygonal Number Identity

Pages 221-222 | Received 03 Aug 2020, Accepted 14 Sep 2020, Published online: 06 Mar 2024
 

Summary

We illustrate the identity Cn,n+2=Cn+2,n+1, where Ck,n denotes the nth k-gonal number.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

Roger B. Nelsen

ROGER NELSEN (MR Author ID: 237909) is a professor emeritus at Lewis & Clark College, where he taught mathematics and statistics for 40 years.

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