Maths vs Stats computations

 If total time taken to calculate perfect numbers from 1 to 10000 is 12 seconds(on i5 2nd gen 12gb ram)

then find out total time taken for perfect numbers

from 1 to 20000?

sol:

24 seconds is wrong 

Because as the number becoming large, computation

calculation increases there by delay in time

So time is 54 seconds(in my system)

#Find  all perfect number 1 -100

import time as t

start=t.time()

z=1

while z<=20000:

    n=z

    i=1

    sum=0

    while i<n:

        if n%i==0:

            sum=sum+i

        i=i+1

    if sum==n:

        print(n, end="\t")

    z=z+1

end=t.time()

print("Total time #",end-start, " seconds")