Uitwerking: Priemfactorontbinding
import time
print('give a number to factorize')
x = int(input())
print(x, '=', end='')
i = 2
starttime = time.time()
while x > 1:
if x % i == 0:
print(str(i), end = '')
x = x // i
if x != 1:
print('*', end = '')
else:
i = i+1
print('\nruntime: ' + (str(time.time() - starttime)) + ' seconds')