2 2 2 Z = X + Y
2 2 2
X + Y = Z
2 2 2
3 + 4 = 5
2 2 2
5 + 12 = 13
2 2 2
6 + 8 = 10
2 2 2
8 + 15 = 17
2 2 2
9 + 12 = 15
2 2 2
12 + 16 = 20
(...)
n n n
X + Y = Z {X,Y,Z,n} ∈ N X.Y.Z # 0
