20200830, 10:23  #1607 
Romulan Interpreter
Jun 2011
Thailand
10001010101100_{2} Posts 
Told you I'll bring luck if you put me on that list
This beauty popped up (62 digits, 202 bits): Factor: 11357797528017579440065902285366253196028688791738880200930167 / (P1, B1=1500000, B2=75000000) Unfortunately, not prime, grrr... it would have been a nice "absolute ever" record. It splits into 122+81 bits, the larger of which is just a pinch smaller that my former record, and now I have two positions in top300, (yay!), at 257 and 281. BloodIce, I come for you! One odd thing worth mentioning: when I reported it, the server recorded it two times (once for each factor) and it gave me a double amount of credit (one full credit, for each factor). Last fiddled with by LaurV on 20200830 at 10:32 Reason: odd part 
20200830, 13:16  #1608 
"James Heinrich"
May 2004
exNorthern Ontario
6067_{8} Posts 
It's a known thing. Once the server receives your factor it's checked and (if necessary) split into prime factors, and then processed as if you had submitted each prime factor separately. If both happen to be new factors then you get a "bonus". Consider it an incentive to find more composite factors.

20200830, 16:30  #1609 
Random Account
Aug 2009
U.S.A.
2·811 Posts 

20200830, 16:37  #1610  
"Curtis"
Feb 2005
Riverside, CA
2×47^{2} Posts 
Quote:
Try the "factoring" subforum for more info. 

20200830, 17:21  #1611  
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
8751_{10} Posts 
Quote:


20200830, 17:23  #1612  
"James Heinrich"
May 2004
exNorthern Ontario
53×59 Posts 
Quote:
(tool is online, calculations are done on your machine in the browser) https://www.mersenne.ca/factor.php can also be used to factor small numbers (up to 45 digits, but also larger numbers that are Mersenne factors). If you have YAFU installed, just open it and type factor(11357797528017579440065902285366253196028688791738880200930167) and you'll get your answer. This is what mersenne.ca does internally when it encounters a composite factor, and if it can't get the answer quickly (within a few seconds) then I can run that manually on my morepowerful home computer. Most numbers can be factored quickly, some can take forever (just ask M1277). 

20200901, 15:40  #1615 
Apr 2010
Over the rainbow
4612_{8} Posts 
Can I ask how long did the curve take? And would it be advisable to repeat one or two curves with the same bound to find similar sized other factor? ( atm the cofactor has been Prp'ed and show not prime).
edit: I realise it should have been a T65 curve, my apologies. Last fiddled with by firejuggler on 20200901 at 15:52 
20200901, 15:56  #1616 
"James Heinrich"
May 2004
exNorthern Ontario
C37_{16} Posts 

20200901, 19:27  #1617  
"Curtis"
Feb 2005
Riverside, CA
2×47^{2} Posts 
Quote:
I don't think you understand ECM at all if you think an extra curve or two has any nontrivial probability to find another factor; never mind that there's no reason at all to think there's another one of the same size lurking just because one was found at this size. Last fiddled with by VBCurtis on 20200901 at 22:29 Reason: Last sentence: before > because. 

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