Create a function that returns the thickness (in meters) of a piece of paper after folding it n number of times. The paper starts off with a thickness of 0.5mm.
def num_layers(a): Sum=0 for i in range(-1,100): for k in range(1,a+1): Sum+=2**i if k==a+1: break return (Sum)/1000
Where am I going wrong?I have written it according to the logic but not getting desired result
Source: Python-3x Questions