20141015, 07:23  #12 
"Jane Sullivan"
Jan 2011
Beckenham, UK
143_{16} Posts 
On my laptop those C76s take at most 5 minutes to factor using YAFU and are not worth reporting.

20141015, 10:45  #13 
Feb 2013
111101101_{2} Posts 
Thanks for reminding me about that.
Working on a C83 right now. I posted here because there was an upload problem of the results. Thanks for giving me a hand! But the important thing is really the assumption that all numbers in fact are linked to each other, regardless of size or composition. Factoring numbers more or less in sequence may partly solve the given problem, but also we know that there are some unanswered questions. I earlier mentioned the composite factor of 2^4096+1. Am I perhaps wrong, but is not such a problem being attempted solved by means of an "approximation"? Being able to factorize a number makes the remaining part of the problem a little bit smaller, of course. In the end you may go through all the numbers that you have and may be able to "pick" the missing number(s) from the list that you are having. Most likely you may be able to solve the problem this hard way, but it may take a long time to do just that. Last fiddled with by storflyt32 on 20141015 at 10:53 
20141015, 10:55  #14  
"Bob Silverman"
Nov 2003
North of Boston
2^{2}×1,877 Posts 
Quote:


20141015, 11:17  #15 
Feb 2013
17·29 Posts 
Exactly.
http://factordb.com/index.php?id=1100000000716601856 One more problem solved. One less to go. But are you still getting the whole picture? Yes, I do know that this webpage are all about Mersenne numbers. I do a little bit a prime number cracking. My account data for this is found here: http://www.primegrid.com/show_user.php?userid=170706 We happen to know about the largest prime number being a Mersenne number, because of an assumption that those numbers having a 1 is a little bit easier to "crack" than a similar +1 number, like a Proth number or a Genefer number for that matter. So what is the "probability" of finding a prime number when comparing a Mersenne number against a Genefer number? Am I standing a better chance of finding a prime by means of using the Prime95 client. I shall be looking around and see if a can find this application once more. Unfortunately I have not had the opportunity at using this client for a little while because of both hard disc problems as well as a couple of other things as well. 
20141015, 12:54  #16 
Feb 2013
493_{10} Posts 
http://factordb.com/index.php?query=...101%2B1%29%2F7
The remaining number is a composite, C20250, but apparently not working here. Tried using both Yafuwin32 as well as Yafux64. 
20141015, 16:35  #17 
Feb 2013
755_{8} Posts 
Just added a PRP1080 to our current knowledge.
The weblink is for now a little long when it comes to syntax, so please let me know if you are interested. Last fiddled with by storflyt32 on 20141015 at 16:36 
20141015, 16:40  #18  
"Curtis"
Feb 2005
Riverside, CA
3·1,879 Posts 
Quote:
You say you like to crack prime numbers that's usually quite difficult, per the definition of "prime". 

20141015, 16:42  #19  
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
2749_{16} Posts 
The numbers that you are describing as new knowledge are just like water sloshing back and forth at an ocean beach. Now look at the vastness of the whole ocean. Think for a moment. And stop posting things that are being posted by thousands of other people silently to factordb.com at a speed of ten per second. Does each of them deserve a posting? Ten postings to mersenneforum per second with just bare numbers?
Quote:
Post a few more and you will get a day ban for posting, then a week, then a month. this already happened to the user "cmd", so you will be in a good company. 

20141015, 21:58  #20 
Feb 2013
17×29 Posts 
Which factors are there for 2^488531, if I may ask?
Also, why not give a try on 2^(2^20)+1 ( or 2^(2^20)1 ) for that matter? Definitely you should be able to find a decent prime in such a number. Last fiddled with by storflyt32 on 20141015 at 22:04 
20141015, 21:59  #21 
Jun 2014
2^{3}·3·5 Posts 
Have you tried checking http://factordb.com/index.php?query=2%5E488531? I hear it's a good source of information.
Last fiddled with by legendarymudkip on 20141015 at 22:03 
20141015, 22:08  #22 
Feb 2013
17×29 Posts 
Apparently the P(RP)1764 in that number was pulled out again :(

Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Can Pollard Rho cycles be used to find a factor?  wwf  Factoring  26  20130930 04:24 
PFGW can't find a small factor.  Arkadiusz  Software  7  20130218 12:43 
Chance to find an ndigit factor with ECM  RedGolpe  Factoring  4  20070323 15:24 
How much ECM does it take to find a given factor?  geoff  Factoring  5  20040929 20:14 
Where I find the best program to it factor keys? I use AMD.  chrow  Factoring  5  20040219 10:15 