0
Blitz 2D/3D, 102 bytes
Graphics 180,180
Origin 90,90
n=Input()
For i=1To n
t#=i*137.508
r#=Sqr(t)
Plot r*Cos(t),r*Sin(t)
Next
An input of 50 fills the window. (Yes, I could shave off two bytes by doing Graphics 99,99, but that's not nearly so visually interesting or useful.)
Prettier versio...