20110909, 13:05  #1 
"James Heinrich"
May 2004
exNorthern Ontario
2^{2}×11×71 Posts 
Registering DC'd P1 assignments >10M
There has been scattered discussion of the problem in various threads (e.g. 1,2) but no official answer that I've seen:
It seems that all exponents >10M that have been doublechecked are not available to register via PrimeNet. Can we please undo this lockout? Those of us who are working in that range will continue to work in that range whether it's locked or not, but the chance of a lot of wasted duplicated work is significantly higher if we can't register the assignments as normal. 
20110909, 18:12  #2 
Dec 2010
Monticello
2^{4}×107 Posts 
Seems to me that the assignments page should let us know (a warning) that we are doing P1 on something that has been DC'ed.

20110910, 05:31  #3 
Bemusing Prompter
"Danny"
Dec 2002
California
100100000100_{2} Posts 
Those numbers have already been proven as composite. Why would you want to reserve them?

20110910, 10:14  #4 
Jun 2003
7·167 Posts 

20110910, 11:53  #5 
Dec 2010
Monticello
2^{4}×107 Posts 
More specifically, because factors are a much more directly verifiable proof of compositeness than LL tests.
Otherwise, what are we doing ECM for? 
20110910, 12:19  #6  
Account Deleted
"Tim Sorbera"
Aug 2006
San Antonio, TX USA
17×251 Posts 
Quote:
While, obviously, you're right that factors are a much more directly and easily verifiable proof of compositeness, matching LL residues leave practically zero doubt. I personally see very little point in searching for factors for the sake of a more certain/verifiable proof. 

20110910, 12:30  #7 
"James Heinrich"
May 2004
exNorthern Ontario
2^{2}·11·71 Posts 
There's a small contingent of us who likes to find factors for the sake of finding factors. Some search for P1 factors where the original P1 test was skipped or poorly done; some search for factors when one (or more) small factors are already known. Does it contribute to the advancement of the LL wavefront? No. Does it contribute to GIMPS progress? I'd say yes if you consider the 3 aims:
1) find Mersenne Primes (no) 2) prove all other Mersenne number composite (somewhat) 3) fully factor all Mersenne numbers (yes) But the main goal is not for GIMPS credit, or fame and fortune, but because we like finding factors. At least the above applies for me, I'm sure we all have slightly different reasons for doing what we're doing. 
20110910, 16:38  #8 
Bemusing Prompter
"Danny"
Dec 2002
California
904_{16} Posts 
I guess you don't really care that much about finding a new Mersenne prime then. :P

20110910, 19:49  #9 
"James Heinrich"
May 2004
exNorthern Ontario
2^{2}×11×71 Posts 

20110911, 02:04  #10 
Sep 2010
Annapolis, MD, USA
3^{3}×7 Posts 
James, I just checked the primenet status (http://mersenne.org/primenet/) and it looks like the line that used to divide "sub10M" from "10M+" has become a line to divide "sub20M" from "20M+". I haven't tried grabbing an assignment between 1020M, but they are now available for ECM work. I suspect that means they are available for generic assignment.

20110911, 03:19  #11 
"James Heinrich"
May 2004
exNorthern Ontario
2^{2}·11·71 Posts 
I am now able to register the 10Mrange exponents I'd been working on.

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