Weird factors

rekcahx · 2011-09-04, 18:46

Some weeks ago, I factored a few thousand randomly selected 90 digits composites from the factordb. Now I looked into factors.txt and I found some weird results, in example:

1555600700000000000000001601024200000000000000000010427
1555600700000000000000001601024200000000000000000012803
1555600700000000000000001601024200000000000000000018191

I tried look from the factordb how "main composite" is constructed, I clicked "more information" and "is factor of" link until there is no more "is factor of" links.

One example:

Factor:
7778003500000000000000008005121000000000000000000432629
Composite I factored:
574166525689372583386983375886424776249597458537594753827543049623918327174225618805158377
http://factordb.com/index.php?id=1100000000413224888
Main composite: C110, http://factordb.com/index.php?id=1100000000398828388

I can see, that there is lot of sequential zeros in this main composite, but I can't see where it comes.

Any ideas?

60 weird factors in attachment.

kar_bon · 2011-09-04, 20:33

cmd has filled in thousands of factors from such sequences in the FactorDB.
See his posts.... ähm... better his pictures... you will find much examples in there.

PS: See like here

cmd · 2011-09-05, 00:26

free_dd M_it

add ... doubles hump in front ...

|°°|

SarK0Y · 2011-11-01, 23:25

Quote:

Originally Posted by rekcahx

Some weeks ago, I factored a few thousand randomly selected 90 digits

perhaps, random generator makes tricks, try another one. some generators can be doctored to produce weak RSA numbers

2011-09-04, 20:33	#2
kar_bon Mar 2006 Germany 2×1,433 Posts	cmd has filled in thousands of factors from such sequences in the FactorDB. See his posts.... ähm... better his pictures... you will find much examples in there. PS: See like here Last fiddled with by kar_bon on 2011-09-04 at 20:39

2011-09-05, 00:26	#3
cmd "(^r'°:.:)^n;e'e" Nov 2008 ;t:.:;^ 3³×37 Posts	free_dd M_it add ... doubles hump in front ... \|°°\| Attached Thumbnails Last fiddled with by cmd on 2011-09-05 at 00:35

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