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Topic: Prime factorization
Replies: 17   Last Post: Nov 16, 2013 9:40 AM

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Michael F. Stemper

Posts: 108
Registered: 9/5/13
Re: Prime factorization
Posted: Nov 16, 2013 9:40 AM
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On 11/11/2013 10:03 PM, Kermit Rose wrote:
> On Monday, November 4, 2013 12:49:47 PM UTC-5, Michael F. Stemper wrote:
>> On 11/04/2013 11:35 AM, me wrote:

>>> tell me what you think?
>>
>>> http://www.davesinvoice.com/papers/factorization2.pdf

>> Interesting idea. How about using it to factor 130642890110987?

>>>> Factor(130642890110987)
> [58789, 2222233583, 134, 'Pollard Rho, x^2 + 1, First factor check']
>
> Pollard Rho is a very efficient means to factor numbers of this size.
>
> It factored 130642890110987 almost instantly in 134 steps
> into 58789 * 2222233583. It iterated on the polynomial x^2+1.


Yeah, and I could have done it on the command line, too:

mstemper@coelurosaur$ time factor 130642890110987
130642890110987: 58789 2222233583

real 0m0.027s
user 0m0.000s
sys 0m0.008s
mstemper@coelurosaur$

I was hoping that that the OP would apply the method described in
his/her so-called "paper" to this number. Since the method is stated
to be guessing, it might have taken a while.

--
Michael F. Stemper
The name of the story is "A Sound of Thunder".
It was written by Ray Bradbury. You're welcome.



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