I used the fact that 22 is composed of either: 2 odds and 1 even OR 3 evens, mapping that on the grid meant putting an even in the middle and the having 2 all even radii and 4 of 2 odds and one even. filling in lead to the first solution. doesn't give you a repeatable method but hey ho
I used the fact that 22 is composed of either: 2 odds and 1 even OR 3 evens, mapping that on the grid meant putting an even in the middle and the having 2 all even radii and 4 of 2 odds and one even. filling in lead to the first solution. doesn't give you a repeatable method but hey ho