Paul Rubin <[email protected]>:
> This takes about 4 seconds on a Intel(R) Core(TM) i5-3230M CPU @ 2.60GHz
> laptop (64 bit linux):
Converted to Python3:
========================================================================
#!/usr/bin/env python3
import itertools, time
def candidates():
yield 2
yield 3
for i in itertools.count(5,6):
yield i
yield i+2
def fac(n):
for c in candidates():
if c*c > n:
yield n
break
while n%c == 0:
yield c
n //= c
t0 = time.time()
print(list(fac(2**111+1)))
print(time.time() - t0)
========================================================================
This is slightly faster:
========================================================================
#!/usr/bin/env python3
import time
def fac(n):
for c in range(n):
if c*c > n:
yield n
break
while n%c == 0:
yield c
n //= c
t0 = time.time()
print(list(fac(2**111+1)))
print(time.time() - t0)
========================================================================
Marko
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