Hypsicles of Alexandria (around 170 BCE) seems to have been one of the first

followed by Theon of Smyrna, Nichomachus and (reported at least in) Plutarch (around 100CE)

this work might be used to focus on number patterns but also could involve:

- developing quadratic nth terms
- solving simultaneous equations in 3 unknowns
- proof, involving triangular numbers

these resources focus on the centred polygonal numbers

a geogebra version with sliders

pictures created by Stefan Birkner

pictures created by Claudio Rockini

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