Mersenneplustwo Google Group

Re: WEP-M+2/M+2 Project loss of internet connection

2008-10-08T15:53:34Z

_Seems_ to now be fixed (automatically) [Wednesday 8th Oct 4.30pm
GMT], and therefore I suspect it was a more generic (ie less local)
problem at my ISP. (This has happened once before, though I don't
_remember_ the 'cable' light on the modem going out before). Their
site status report lists/listed an issue ticket for roundabout this

WEP-M+2/M+2 Project loss of internet connection

2008-10-08T12:50:35Z

Hello crunchers!
I regret to inform you that as of late this Wednesday morning (8th
October) I/we have been without our main (broadband) internet
connection (I am posting this from a backup, dial-up connection). It
may just be coincidence, but there is some major roadworks (replacing
a water main with plastic pipe) going on right outside atm.

Re: project out of work?

2008-09-22T14:00:08Z

D'oh!! I've just noticed/I think my indices in all the below are off
by one :( - but maybe you'd all worked that out already?! [so due to
this rather careless programming error, the exact values of a are all
one step of 2p too high] [so better to use factorize6 perhaps, where
I _did_ get this detail right] It's a fairly trivial point, but may

2*18-digit factors of (M+2)43112609 by trial-factoring

2008-09-17T10:28:30Z

tiggatoo:~/math/tfc james$ time ./mpptf16 -P43112609 -S1 -
T10000000000
1 86225219
61 5259738299
69 5949540043
144772 12482997260297
5259738360 453522086713962481
5949540112 513000393156944417

Fish!!

2008-09-16T13:42:36Z

Congratulations once again to the GIMPS project, who have just
released details of their new primes:
[link]
This, of course, means new ponds! :) - and there's fish already...
[website updated today]
J

Re: 21-digit factor of general number by WE, in seconds...

2008-09-01T14:44:34Z

I think I've found out how to construct these...
here's another that finds a 36-digit factor instantly:
f(2^102*2203+1)*(2^2203-1)
J

21-digit factor of general number by WE, in seconds...

2008-08-29T15:38:22Z

...shows the WE algorithm can work spectacularly well, at least
_sometimes_!
A while ago, while experimenting with the WE algorithm (actually
running as part of superfac9), I came across this particular
combination of primes into a semiprime, after a dozen or so attempts,
which yields an 11-digit factor by WE almost instantly:

21-digit factor of (M+2)3021377 by mprime(OSX)

2008-04-10T08:28:30Z

Just noticed this on Lenny (the MacBook)... update to website to
follow:

[Tue Apr 8 00:34:45 2008]
ECM found a factor in curve #82, stage #2
Sigma=1798474291860981, B1=50000, B2=5000000.
2^3021377+1 has a factor: 510207862179110491801

Another possibly good indication...

2007-12-25T09:42:56Z

Lenny:wec james$ time ./factorize3.gmp -P1257787 -T1 3
P1257787 T1 20124593 base=2615168526332661693465858 981504019713

real 70462m29.049s
user 58398m41.613s
sys 846m42.452s

So WEP found the 8-digit factor in just _one_ iteration. [and yes, it
really did just finish today :)] The only snag being it takes several

Re: 21-digit factor of (M+2)1257787 by mprime(OSX)

2007-12-05T07:40:52Z

Well, it doesn't really impact on the WEP-M+2 project, which is still
testing the WEP algorithm, without yet, any conclusive results either
way.
This factor was found (by me) using the Elliptic Curve Method, and is
of interest as a new factor (of a reasonable size too) in the general
search for factors in the M+2 project.

Re: 21-digit factor of (M+2)1257787 by mprime(OSX)

2007-12-05T05:54:33Z

For us gruts, what is the significance?

21-digit factor of (M+2)1257787 by mprime(OSX)

2007-11-29T07:07:30Z

[Wed Nov 28 22:47:33 2007]
ECM found a factor in curve #78, stage #1
Sigma=8980558820546872, B1=50000, B2=5000000.
2^1257787+1 has a factor: 900228597258955415819

Re: project out of work?

2007-10-08T10:16:57Z

Mind you, the world would be a better place if money were illegal!
J

New BLOG

2007-09-22T08:04:09Z

One final (!) point for today...
I don't know how long I'll be able to keep it going with new stuff,
but I've started a 'Factorization' Blog, over at:
[link]
J

Re: project out of work?

2007-09-22T07:56:40Z

This is the current state-of-play regarding those extra tests I
mentioned. I am currently pursuing P4253 in the hope of finding its 14-
digit factor(s), ideally fairly soon. But anyway, here are the results
I have so far (and on which I base/d my promising outlook). If anyone
wants to repeat them/extend them, I'm posting the source of the C file