Tootfinder

Hypothesis, [[past time]]: there are #117 magnetic balls here, as I guessed 10 fewer than 127 (the full hexagon as given by the [[centered hex numbers]] sequence)

Innocent fun with [[hex]] numbers tonight :)
https://github.com/flancian/garden/commit/3d4e608b6cb78aa55b039cd6ce0716e9d8275e9d
See e.g.

Had pure fun writing this :) · flancian/garden@3d4e608
First I calculated hex(11) in my head, took about half an hour. Then I tried to make sense of the sequence the best I could before looking up the closed form.