PFGW can't find a small factor.
 

For example,
2362339121*2^1018-1 has no small factor.

mod(2362339121*2^1018-1, 17) = 0. :huh:

[QUOTE=Arkadiusz;329844]For example,
2362339121*2^1018-1 has no small factor.

mod(2362339121*2^1018-1, 17) = 0. :huh:[/QUOTE]

Thanks. I will investigate.

[QUOTE=Arkadiusz;329844]For example,
2362339121*2^1018-1 has no small factor.

mod(2362339121*2^1018-1, 17) = 0. :huh:[/QUOTE]

What version?

[CODE]PFGW Version 3.6.0.32BIT.20111222.Win_Dev [GWNUM 26.6]

2362339121*2^1018-1 has factors: 17[/CODE]

[CODE]PFGW Version 3.7.2.64BIT.20130122.x86_Dev [GWNUM 27.9]
2362339121*2^1018-1 is composite: RES64: [3DE9C23DFB42D757] (0.0017s+0.0267s)
...
PFGW Version 3.7.3.32BIT.20130210.Win_Dev [GWNUM 27.8]
2362339121*2^1018-1 is composite: RES64: [3DE9C23DFB42D757] (0.0022s+0.0838s)
PFGW Version 3.7.3.64BIT.20130210.Win_Dev [GWNUM 27.8]
2362339121*2^1018-1 is composite: RES64: [3DE9C23DFB42D757] (0.0020s+0.0295s)[/CODE]
- probably introduced later than 3.6.0

What is the command line?

pfgw[32|64]{s} -q2362339121*2^1018-1

or

pfgw[32|64]{s} -t -q2362339121*2^1018-1

or

pfgw[32|64]{s} -t -f -q2362339121*2^1018-1

?

Luigi

I used -f -q (in windows command line you have to escape the ^ with ^^)

Open WinPFGW Version 3.6.5.
PFGW Version 20130210.
pfgw -f -o input file.txt

3.6.7 finds the factor, but 3.7.3 does not. I assume it was due to reintroduction of the tree factoring code. I'm getting help from someone much more familiar with that code.