Never mind.
I managed to get the program to work by input.txt as documented..:smile:

Wow, this is a dizzyingly fast program. Thank you very much for having it developed.:smile:

* Is there a way to run multiple instances of the program on a single machine to use more of the available CPU power?

Thanks in advance.

My recommendation is to use the console version, not the GUI version.

In any case, create a directory for each copy that you want to run then run each copy from its own directory.

Thank you, I will try that. I have already tried that with the GUI On windows 10 but didn't start more than one instance. Will try the console.
Again thank you for a great software. Shouldn't be long before I prove my 1st Top 5k. Barring any bad luck it should be later today.

For the record my candidate ended up being composite.:smile:
Back to the drawing board.

2/3*3 is Zero (0)
 

This is a problem in PFGW Version 3.8.3.64BIT.20161203.Win_Dev [GWNUM 28.6]

-q"23°/3"
2/3*3 is Zero (0)

What is this number?

[QUOTE=Kebbaj;490199]-q"23°/3"[/QUOTE]

[QUOTE=rogue;490204]What is this number?[/QUOTE]


This is a problem in PFGW Version 3.8.3.64BIT.20161203.Win_Dev [GWNUM 28.6]

the numbre is -q"2/3*3"
2/3*3 is Zero (0)

exemple:
try to test whith pfgw the numbre :
1+3/89*7919#
1+(3*7919#)/89

Normaly 1+3/89*7919# = 1+(3*7919#)/89
but pfgw don't give the same result ?

This is not a problem with pfgw, but a problem with how you expect pfgw to function.

In pfgw, every value is treated as an integer, even intermediate values computed from expressions. This means that if you are using division in your expression, make sure that the expression computes the entire numerator before applying the denominator.

[CODE]
PFGW Version 3.8.3.64BIT.20161203.Win_Dev [GWNUM 28.6]

Primality testing *** [N-1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3


Done.
[/CODE]


So Is it a prime or not?:smile:

[QUOTE=a1call;494582][CODE]
PFGW Version 3.8.3.64BIT.20161203.Win_Dev [GWNUM 28.6]

Primality testing *** [N-1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3


Done.
[/CODE]


So Is it a prime or not?:smile:[/QUOTE]

[URL="https://en.wikipedia.org/wiki/Garbage_in%2C_garbage_out"]GIGO[/URL]. What is "it"? "***"?