20170210, 15:14  #155  
Sep 2002
Database er0rr
E50_{16} Posts 
Quote:
Code:
? isprime(111111111111111111111111111111111111061) 1 

20170210, 15:49  #156  
"(^r'°:.:)^n;e'e"
Nov 2008
;t:.:;^
3^{3}×37 Posts 
°<
Quote:
thx 

20170212, 02:29  #157  
"(^r'°:.:)^n;e'e"
Nov 2008
;t:.:;^
999_{10} Posts 
Quote:
fdb now works again, but the link id=1100000000900921624 is still wrong "status C" .. erase .. 

20170212, 11:50  #158 
"(^r'°:.:)^n;e'e"
Nov 2008
;t:.:;^
3^{3}·37 Posts 

20170215, 13:23  #159 
"Geoffrey Yeung"
Feb 2017
London
18_{10} 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 39digit numbers labelled "C" are actually prime? 111111111111111111111111111111111111061 111111111111111111111111111111111111061 111111111111111111111111111111111110957 111111111111111111111111111111111110947 Last fiddled with by GeoffreyY on 20170215 at 13:46 
20170215, 14:42  #160  
"Jane Sullivan"
Jan 2011
Beckenham, UK
251 Posts 
Quote:
Last fiddled with by BudgieJane on 20170215 at 14:43 Reason: Add "distinct" 

20170215, 20:26  #161 
"Ed Hall"
Dec 2009
Adirondack Mtns
47×79 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?

20170216, 01:15  #162 
"Rich"
Aug 2002
Benicia, California
11×113 Posts 
There is also a C79 in the list of composite numbers without known factors that is prime:
(10^79181)%(10^791)/9 Appears to be more of cmd's handiwork..... Last fiddled with by richs on 20170216 at 01:53 Reason: Updated 
20170218, 04:17  #163  
"(^r'°:.:)^n;e'e"
Nov 2008
;t:.:;^
3^{3}·37 Posts 
Quote:
[__] [ ] [__] 

20170301, 12:53  #164 
Nov 2016
101100000011_{2} Posts 
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*2106811 (equals (2^8529*4591) * (2^8529*459+1)) 2^22910*8372251 (equals (2^11455*9151) * (2^11455*915+1)) Besides, PRP 108^398*109+1 should be easy to prove by N1. But factordb thinks 108^398*109 is 2*5*109 so N1 is only 0.259% factored, I think that there are the same bug to some other numbers. 
20170314, 14:57  #165 
"Geoffrey Yeung"
Feb 2017
London
2×3^{2} Posts 
factordb still thinks that these two are 82 digit composites:
9699691 (id 1100000000912669113) 223092871 (id 1100000000912669114) 
Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
A suggestion for factordb.  enzocreti  FactorDB  10  20210105 19:49 
Extending Factordb  carpetpool  FactorDB  6  20170123 11:04 
FactorDB PRP's  smh  FactorDB  231  20150728 02:30 
bugged sequence in factordb  firejuggler  Aliquot Sequences  2  20100615 14:03 
FactorDB question  Raman  Factoring  15  20100128 10:24 