f(x) = (-1 + sqrt(1 + (8 * floor(x)))) / 2
g(x) = floor(f(x))
i(x) = ((g(x) * (g(x) + 3))) / 2 - floor(x)
j(x) = floor(x) - ((g(x) * (g(x) + 1))) / 2
n = 0 (slider from 0 to 100, step 1)
A: (i(n), j(n))