Other Factordb Problems - Page 15

paulunderwood · 2017-02-10, 15:14

Quote:

Originally Posted by cmd

http://www.factordb.com/index.php?id...00000900921624

is P
not C

Code:

? isprime(111111111111111111111111111111111111061)
1

cmd · 2017-02-10, 15:49

Quote:

Originally Posted by paulunderwood

Code:

? isprime(111111111111111111111111111111111111061)
1

thx

cmd · 2017-02-12, 02:29

Quote:

Originally Posted by cmd

http://www.factordb.com/index.php?id...00000900921624

fdb now works again,

but the link id=1100000000900921624
is still wrong

"status C" .. erase ..

cmd · 2017-02-12, 11:50

Quote:

Originally Posted by cmd

fdb now works again,

.. mo__re ..

Code:

 
	Quote:
	
	
		
			
				
					Originally Posted by cmd
					
				
				fdb now works again,
  














but in image attachments, find

 .. mo__re .. mo_er_dup#keyid ..

GeoffreyY · 2017-02-15, 13:23

The core on "Factoring numbers <70 digits" frequently hangs (last event >1 hour), and there's a large number of small composites without known factors (<30 digits).

Don't think this is normal behavior.

Edit: Can someone double check if the following four 39-digit numbers labelled "C" are actually prime?

111111111111111111111111111111111111061
111111111111111111111111111111111111061
111111111111111111111111111111111110957
111111111111111111111111111111111110947

BudgieJane · 2017-02-15, 14:42

Quote:

Originally Posted by GeoffreyY

The core on "Factoring numbers <70 digits" frequently hangs (last event >1 hour), and there's a large number of small composites without known factors (<30 digits).

Don't think this is normal behavior.

Edit: Can someone double check if the following four 39-digit numbers labelled "C" are actually prime?

111111111111111111111111111111111111061
111111111111111111111111111111111111061
111111111111111111111111111111111110957
111111111111111111111111111111111110947

There are only three distinct numbers here, and they are all prime.

EdH · 2017-02-15, 20:26

I just started doing some Primo certificates in the 2400d range and seem to be getting a lot of composites from the PRP listing. Is this indicative of a problem associated with the above mentioned C vs. P issues, or is it normal?

richs · 2017-02-16, 01:15

There is also a C79 in the list of composite numbers without known factors that is prime:

(10^79-181)%(10^79-1)/9

Appears to be more of cmd's handiwork.....

cmd · 2017-02-18, 04:17

Quote:

Originally Posted by richs

There is also a C79 in the list of composite numbers without known factors that is prime:

(10^79-181)%(10^79-1)/9

Appears to be more of cmd's hand_[i]_work..

id .. times

[__] [ ] [__]

sweety439 · 2017-03-01, 12:53

There are primes that return composite in factordb, such as:

4*143##+1
4*173##+1
4*186##+1
4*180##-1
4*228##-1
4*268##-1
4*301##-1

Also, there are composites that return prime in factordb, such as:

2^17058*210681-1 (equals (2^8529*459-1) * (2^8529*459+1))
2^22910*837225-1 (equals (2^11455*915-1) * (2^11455*915+1))

Besides, PRP 108^398*109+1 should be easy to prove by N-1. But factordb thinks 108^398*109 is 2*5*109 so N-1 is only 0.259% factored, I think that there are the same bug to some other numbers.

GeoffreyY · 2017-03-14, 14:57

factordb still thinks that these two are 82 digit composites:
9699691 (id 1100000000912669113)
223092871 (id 1100000000912669114)

2017-02-15, 13:23	#159
GeoffreyY "Geoffrey Yeung" Feb 2017 London 2×3² Posts	The core on "Factoring numbers <70 digits" frequently hangs (last event >1 hour), and there's a large number of small composites without known factors (<30 digits). Don't think this is normal behavior. Edit: Can someone double check if the following four 39-digit numbers labelled "C" are actually prime? 111111111111111111111111111111111111061 111111111111111111111111111111111111061 111111111111111111111111111111111110957 111111111111111111111111111111111110947 Last fiddled with by GeoffreyY on 2017-02-15 at 13:46

2017-02-16, 01:15	#162
richs "Rich" Aug 2002 Benicia, California 17×71 Posts	There is also a C79 in the list of composite numbers without known factors that is prime: (10^79-181)%(10^79-1)/9 Appears to be more of cmd's handiwork..... Last fiddled with by richs on 2017-02-16 at 01:53 Reason: Updated

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
A suggestion for factordb.	enzocreti	FactorDB	10	2021-01-05 19:49
Extending Factordb	carpetpool	FactorDB	6	2017-01-23 11:04
FactorDB PRP's	smh	FactorDB	231	2015-07-28 02:30
bugged sequence in factordb	firejuggler	Aliquot Sequences	2	2010-06-15 14:03
FactorDB question	Raman	Factoring	15	2010-01-28 10:24

2017-02-15, 20:26	#161
EdH "Ed Hall" Dec 2009 Adirondack Mtns 2⁵×113 Posts	I just started doing some Primo certificates in the 2400d range and seem to be getting a lot of composites from the PRP listing. Is this indicative of a problem associated with the above mentioned C vs. P issues, or is it normal?

2017-03-01, 12:53	#164
sweety439 Nov 2016 101011110011₂ Posts	There are primes that return composite in factordb, such as: 4143##+1 4173##+1 4186##+1 4180##-1 4228##-1 4268##-1 4301##-1 Also, there are composites that return prime in factordb, such as: 2^17058210681-1 (equals (2^8529459-1) (2^8529459+1)) 2^22910837225-1 (equals (2^11455915-1) (2^11455915+1)) Besides, PRP 108^398109+1 should be easy to prove by N-1. But factordb thinks 108^398109 is 25*109 so N-1 is only 0.259% factored, I think that there are the same bug to some other numbers.

2017-03-14, 14:57	#165
GeoffreyY "Geoffrey Yeung" Feb 2017 London 2×3² Posts	factordb still thinks that these two are 82 digit composites: 9699691 (id 1100000000912669113) 223092871 (id 1100000000912669114)