Pebbles

There are lots of solutions to this problem, depending on the questions you choose to ask.

Have a go yourself, and if you discover anything interesting then let us know !Please don't worry that your solution is not "complete" - we'd like to hear about anything you have tried.

I present this table of results and the visual one just as an example of the kinds of solutions you may get. Obviously the numbers can then be explored much further.

or, if you prefer;