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x = 9*102y+z+9
a = x1/2
a is an integer
x = 9*(102y+z/9+1)
a = 3*(102y+z/9+1)1/2

let c = 10y
f = (3c+3)2
f = 9c2+18c+9
f ∈ a, y > 1

let g(y) = f

g(-n), g(1-n), ..., g(-4), g(-3), g(-2), g(2), g(3), g(4), ..., g(n-1), g(n) =
..., 9.0018009, 9.018009, 9.1809, 91809, 9018009, 900180009, ...

f for any integer y is a square number, when y ≠ ±1

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