strange thing happening in factordb

firejuggler · 2011-12-20, 08:56

ok, it seems that someone is feeding factodb with tens of thousands 41 digit long composite... a faw hours ago, it got from 15 000 41-digits number, down to 0 and now there is about 30k new 41-digits composite... Syd, please stop this.. i'm using the yafu script to help diminish that number, but that won't be enough.

LaurV · 2011-12-20, 09:25

I saw that too, methinks that is an error somewhere in the elves, all these numbers are of the same form and when click on "more info" they all show as factors of 217104448554459483532131214896581817097980524333470831788895962466810110829472107
which is in fact = 3331 · 4746402517<10> · 931955472496582424848090961<27> · 14734464651098101010101014734464646510981<41>

All the numbers of 41 digits that appear there are just running odd numbers (all of them, consecutive) from the C41 above, onwards. Smells fishy.

edit: they are down to 13k from 22k "pieces" in the last 10 minutes. I put my "yoyo" on them too, so they will be gone in 10-15 minutes.

10metreh · 2011-12-20, 09:33

While the p10 and p27 look reasonably natural, the p41 is quite obviously artificial. Very suspicious.

kar_bon · 2011-12-20, 09:55

Look here and here and you see what's (who's) going on there. It's not the first time.

LaurV · 2011-12-20, 09:57

4800 left, I stopped my "yoyo". Anyhow, the server was handling them much faster then it could transfer them to me, I did about 100 and most of them ended up as "factors already known", so it was futile.

I wish we could get rid of C100 and higher, at this speed...

edit:
Now, I take this opportunity to remind Syd about displaying the last two digits of numbers with more then 50 digits... If he ever read this post of mine, that update would be very-very-very useful for aliquots. Pretty-pretty-please!

2800 left

LaurV · 2011-12-20, 10:16

Quote:

Originally Posted by kar_bon

Look here and here and you see what's (who's) going on there. It's not the first time.

Idiot! Now he started with 40 digits. Can anyone block his IP? Or better would be implementation of the "user accounts" part, which seems to be an orphan on the page, and only allow registered users to create ID's? We would have nothing to lose... A reasonable policy could then be enforced on user accounts. Anyhow there is only a small bunch of people which are serious about this activity and report most of the factors... the DB will lose nothing by forbidding anonymous reports.

edit: always 50000 numbers, now already down to 45k, he has a script for it.

kar_bon · 2011-12-20, 10:29

Quote:

Originally Posted by LaurV

edit: always 50000 numbers, now already down to 45k, he has a script for it.

Only Syd can block the IP.

The two posts I gave were originally in the PARI's commands. thread so uses that perhaps (see also some posts above those two).

kar_bon · 2011-12-20, 11:55

Looking here he's doing it like this:

1111111111111111111111111111110000000731*(1111111111111111111111111111110000000731+k) for odd k-values

In the next pages, all numbers are factored (79 digits).

em99010pepe · 2011-12-20, 14:00

Is it down?

firejuggler · 2011-12-20, 15:18

Still down.
"Down for ~2 hours (full backup, optimizing tables, ...)"

Stargate38 · 2011-12-20, 19:01

It's back up, but there is a problem:

http://www.factordb.com/sequences.ph...20&fr=0&to=100

Why aren't the primes <300 digits being proven? Usually they go from PRP to P in a matter of seconds. Also, Why aren't there any workers?

http://www.factordb.com/status.php

Oh my! The problem is worse than I thought:

http://www.factordb.com/listtype.php...e=1000&start=0

Why haven't these been proven yet?

2011-12-20, 08:56	#1
firejuggler "Vincent" Apr 2010 Over the rainbow 5×569 Posts	strange thing happening in factordb ok, it seems that someone is feeding factodb with tens of thousands 41 digit long composite... a faw hours ago, it got from 15 000 41-digits number, down to 0 and now there is about 30k new 41-digits composite... Syd, please stop this.. i'm using the yafu script to help diminish that number, but that won't be enough.

2011-12-20, 09:25	#2
LaurV Romulan Interpreter "name field" Jun 2011 Thailand 3×47×71 Posts	I saw that too, methinks that is an error somewhere in the elves, all these numbers are of the same form and when click on "more info" they all show as factors of 217104448554459483532131214896581817097980524333470831788895962466810110829472107 which is in fact = 3331 · 4746402517<10> · 931955472496582424848090961<27> · 14734464651098101010101014734464646510981<41> All the numbers of 41 digits that appear there are just running odd numbers (all of them, consecutive) from the C41 above, onwards. Smells fishy. edit: they are down to 13k from 22k "pieces" in the last 10 minutes. I put my "yoyo" on them too, so they will be gone in 10-15 minutes. Last fiddled with by LaurV on 2011-12-20 at 09:31

2011-12-20, 09:57	#5
LaurV Romulan Interpreter "name field" Jun 2011 Thailand 3×47×71 Posts	4800 left, I stopped my "yoyo". Anyhow, the server was handling them much faster then it could transfer them to me, I did about 100 and most of them ended up as "factors already known", so it was futile. I wish we could get rid of C100 and higher, at this speed... edit: Now, I take this opportunity to remind Syd about displaying the last two digits of numbers with more then 50 digits... If he ever read this post of mine, that update would be very-very-very useful for aliquots. Pretty-pretty-please! 2800 left Last fiddled with by LaurV on 2011-12-20 at 09:59

2011-12-20, 19:01	#11
Stargate38 "Daniel Jackson" May 2011 14285714285714285714 2²×3×59 Posts	It's back up, but there is a problem: http://www.factordb.com/sequences.ph...20&fr=0&to=100 Why aren't the primes <300 digits being proven? Usually they go from PRP to P in a matter of seconds. Also, Why aren't there any workers? http://www.factordb.com/status.php Oh my! The problem is worse than I thought: http://www.factordb.com/listtype.php...e=1000&start=0 Why haven't these been proven yet? Last fiddled with by Stargate38 on 2011-12-20 at 19:07

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2011-12-20, 09:33	#3
10metreh Nov 2008 2×3³×43 Posts	While the p10 and p27 look reasonably natural, the p41 is quite obviously artificial. Very suspicious.

2011-12-20, 09:55	#4
kar_bon Mar 2006 Germany 101110010111₂ Posts	Look here and here and you see what's (who's) going on there. It's not the first time.

2011-12-20, 11:55	#8
kar_bon Mar 2006 Germany 3×23×43 Posts	Looking here he's doing it like this: 1111111111111111111111111111110000000731*(1111111111111111111111111111110000000731+k) for odd k-values In the next pages, all numbers are factored (79 digits).

2011-12-20, 14:00	#9
em99010pepe Sep 2004 2·5·283 Posts	Is it down?

2011-12-20, 15:18	#10
firejuggler "Vincent" Apr 2010 Over the rainbow 2845₁₀ Posts	Still down. "Down for ~2 hours (full backup, optimizing tables, ...)"