Other Factordb Problems - Page 57

charybdis · 2023-03-10, 15:40

They must have increased the number of IPs they're (ab)using.

If the IPs are all in the same range, perhaps a limit on IDs created per appropriately-sized range per hour is the way to go.

gd_barnes · 2023-03-12, 23:46

Quote:

Originally Posted by charybdis

They must have increased the number of IPs they're (ab)using.

If the IPs are all in the same range, perhaps a limit on IDs created per appropriately-sized range per hour is the way to go.

I like this idea! But a smart spammer might be using many different random IPs that are difficult to isolate to a specific range. You'd almost have to make it a limit on a specific digit-size for everyone as a whole per hour. But that could have a bad effect on everyone else.

Perhaps a solution would be to require that everyone register their ID and Email with the site. That would challenge the spammer a little more; at least make him work a little harder when using multiple IPs. You'd lose the anonymity that we have now. I would not be opposed to that.

Happy5214 · 2023-03-13, 13:55

Unless the new limits have been eased (which it doesn't sound like they have), I think the return of the spam puts to rest any idea that this spammer is a misguided, rather than malicious, individual, as some people here had posited/hoped. Markus should seriously consider contacting the police and/or a security consultant as the next step.

xilman · 2023-03-13, 18:08

Quote:

Originally Posted by gd_barnes

I like this idea! But a smart spammer might be using many different random IPs that are difficult to isolate to a specific range. You'd almost have to make it a limit on a specific digit-size for everyone as a whole per hour. But that could have a bad effect on everyone else.

Perhaps a solution would be to require that everyone register their ID and Email with the site. That would challenge the spammer a little more; at least make him work a little harder when using multiple IPs. You'd lose the anonymity that we have now. I would not be opposed to that.

+1

xilman · 2023-03-13, 18:10

Quote:

Originally Posted by Happy5214

or a security consultant as the next step.

My consultancy rates are very reasonable.

Depending on the information provided, my rates could be somewhere between zero and a few beers on completion of the contract.

storm5510 · 2023-03-14, 00:27

factordb loses me. I picked a number, a play on my dad's birthday, which is 8 digits and searched. It was there. On the far-left side was "FF" meaning fully factored. Behind the number I searched for were several small numbers. How can something be fully factored if the largest factor is three digits long?

VBCurtis · 2023-03-14, 02:07

Quote:

Originally Posted by storm5510

How can something be fully factored if the largest factor is three digits long?

What is it you want to do to the three-digit number to make it more factored?

Are all the smaller numbers supplied by factordb prime?

storm5510 · 2023-03-14, 15:15

Quote:

Originally Posted by VBCurtis

What is it you want to do to the three-digit number to make it more factored?

Are all the smaller numbers supplied by factordb prime?

To your question, they apppear be: 3, 11, 23, 53, 449.

The number I was goofing with is 18061923. ddmmyyyy. I expected a composite of this size to have a larger factor. Then again, maybe not.

None of this is important. Just a curiosity.

bur · 2023-03-14, 18:45

The number of prime factors of a number n is on the order of log(log(n)). An 8 digit number can be tentatively expected to have 3 prime factors. So, a 3 digit prime as the largest factor is not that strange.

https://factordb.com/index.php?query...%2Bn&use=n&n=0

Stargate38 · 2023-05-30, 22:03

Has anyone else noticed the typo under More Information for special form numbers? I just now noticed it:

http://www.factordb.com/index.php?id...00004435617556

"Auto-generated SNFS-Polynominal available!" (should be "Polynomial")

How long has it been this way without us noticing?

AnCo · 2023-08-08, 18:42

This number is composite, even if it's marked as PRP:

http://www.factordb.com/index.php?id...00003939667113

It has a factor 610333938525463207201, and the cofactor is still composite.

I've tried to submit the factor, but the status doesn't change to C.

Curiosly, it became PRP few minutes ago, even if that number is in factordb since October 31, 2022.

EDIT: Searching in this forum by its ID, I see that it's a recurring problem: https://www.mersenneforum.org/showpo...03&postcount=6

2023-03-14, 18:45	#625
bur Aug 2020 796581e-4;32539e-3 2DD₁₆ Posts	The number of prime factors of a number n is on the order of log(log(n)). An 8 digit number can be tentatively expected to have 3 prime factors. So, a 3 digit prime as the largest factor is not that strange. https://factordb.com/index.php?query...%2Bn&use=n&n=0 Last fiddled with by bur on 2023-03-14 at 18:46

2023-05-30, 22:03	#626
Stargate38 "Daniel Jackson" May 2011 14285714285714285714 2²×193 Posts	Has this always been like this? Has anyone else noticed the typo under More Information for special form numbers? I just now noticed it: http://www.factordb.com/index.php?id...00004435617556 "Auto-generated SNFS-Polynominal available!" (should be "Polynomial") How long has it been this way without us noticing? Last fiddled with by Stargate38 on 2023-05-30 at 22:07

2023-08-08, 18:42	#627
AnCo Jun 2023 2 Posts	This number is composite, even if it's marked as PRP: http://www.factordb.com/index.php?id...00003939667113 It has a factor 610333938525463207201, and the cofactor is still composite. I've tried to submit the factor, but the status doesn't change to C. Curiosly, it became PRP few minutes ago, even if that number is in factordb since October 31, 2022. EDIT: Searching in this forum by its ID, I see that it's a recurring problem: https://www.mersenneforum.org/showpo...03&postcount=6 Last fiddled with by AnCo on 2023-08-08 at 18:52

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2023-03-10, 15:40	#617
charybdis Apr 2020 2×569 Posts	They must have increased the number of IPs they're (ab)using. If the IPs are all in the same range, perhaps a limit on IDs created per appropriately-sized range per hour is the way to go.

2023-03-13, 13:55	#619
Happy5214 "Alexander" Nov 2008 The Alamo City 2³·127 Posts	Unless the new limits have been eased (which it doesn't sound like they have), I think the return of the spam puts to rest any idea that this spammer is a misguided, rather than malicious, individual, as some people here had posited/hoped. Markus should seriously consider contacting the police and/or a security consultant as the next step.

2023-03-14, 00:27	#622
storm5510 Random Account Aug 2009 Oceanus Procellarum 5707₈ Posts	factordb loses me. I picked a number, a play on my dad's birthday, which is 8 digits and searched. It was there. On the far-left side was "FF" meaning fully factored. Behind the number I searched for were several small numbers. How can something be fully factored if the largest factor is three digits long?