20190308, 13:59  #1 
Sep 2002
Vienna, Austria
3×73 Posts 
Spammers in FactorDB
As we know, lots of nonsensical composites are being added to the database every hour, overwhelming the factorisation workers and has pushed the total number of <120 digit composites up to 900K. I've noticed some trends among these abominations, and it looks like the spammer(s) are unaware of the stress they put on the database, and are merely abusing it in order to find primes.
Here are some common types of the useless composites they produce:
The database search function should really be fixed so that it does not produce unwanted composites. 
20190308, 16:50  #2 
Sep 2009
2,153 Posts 
Do any of the other substrings look like a telephone number, zip code, SSN, etc? Or a name when converted to ASCII?
It would be nice to be able to phone them and tell them what you really think of them (preferably at about 5am their time). Chris 
20190308, 18:32  #3 
Sep 2002
Vienna, Austria
3·73 Posts 
I can identify two further birthdays (both in the 60s), presumably their parents....

20190309, 13:14  #4  
Feb 2017
Nowhere
4,831 Posts 
Quote:
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20190415, 14:04  #5 
Mar 2018
3·43 Posts 
Somebody submitted about 11 thousand 300digit PRPs that are most likely literally consectutive primes. Example.
From the ones I checked, only the last 7 digits are varying. With the average gap at that size 11000 * 300*ln(10) ≈ 7.6e6, thus I'm saying they're very likely just consectutive. Sigh. I'ld wish there was a "notable" field for a number in FactorDB (essentially a text comment; autofilled for numbers in the tables, sequences and their factors, +/1 for PRPs) and not notable numbers would be autopurged after some time. Last fiddled with by DukeBG on 20190415 at 14:06 
20190416, 11:19  #6  
Mar 2018
3·43 Posts 
Quote:


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