# coding: utf-8
cells = 1
p = 0.38
probabilities = [0]
for _ in range(20):
    probabilities = (1-p)**(len(probabilities)+1)*(1-probabilities[-1])
    
probabilities = [0]; 
for _ in range(20):
    probabilities.append((1-p)**(len(probabilities)+1)*(1-probabilities[-1]))
    
probabilities
probabilities = [0]; 
for _ in range(1000000):
    probabilities.append((1-p)**(len(probabilities)+1)*(1-probabilities[-1]))
    
probabilities