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  1. from math import sqrt
  2.  
  3. def factors0(n):   # http://stackoverflow.com/a/16007256/849891
  4.     while n > 1:
  5.         for i in range(2, n + 1):
  6.             if n % i == 0:
  7.                 n /= i
  8.                 yield i
  9.                 break
  10.  
  11. def factors(n):    # improve (cf. http://stackoverflow.com/a/15703327/849891)
  12.     j = 2
  13.     while n > 1:
  14.         for i in xrange(j, int(sqrt(n+0.05)) + 1):
  15.             if n % i == 0:
  16.                 n /= i ; j = i
  17.                 yield i
  18.                 break
  19.         else:
  20.             if n > 1:
  21.                 yield n; break
  22.  
  23. # factors0(9000009):  [3,3,101,9901]  0.59s-8.6M
  24. # factors( 9000009):  [3,3,101,9901]  0.08s-8.7M
  25.  
  26. for factor in factors(25*27):   # 600851475143999917  # [41, 37309,      # 0.36s-8.7M 
  27.     print factor                                      #   392798360393]  # 0.36s-8.7M
Success #stdin #stdout 0.08s 8728KB
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https://ideone.com/Ln9sa2
language:
Python (cpython 2.7.16)
created:
11 years ago
visibility:
public

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