Riemann surface
This figure is piling squares which are prime numbers. The pattern includes complex plane , so I think that I can describe Riemann surface. θ=2nπ (n=0,±1,±2........) and arg Z=θ+2nπ (-π<θ≦π). Therefore, arg Z change according to n. n=0 → -π<arg Z≦π n=1 → π<arg Z≦3π n=5 → 9π<arg Z≦11π n=-5 → -11π<arg Z≦-9π ∴(2n-1)π<arg Z≦(2n+1)π Complex planes Z depend on n, and these are piled infinitely.