[QUOTE=lavalamp;173033]No, I just posted it here. I'll send George a PM now, but am I right in thinking that Will Edgington is wblipp?

Incidentally, does anyone know how deeply MM127 has been trial factored? I can't find much information about it but did read from a very old newsgroup post that Will Edgington kept a record of trial factor depths for it, though I couldn't find it.

I wrote some very basic PHP code using the bcmath functions to trial factor it to 145 bits which took absolutely ages to run (9 mins). Does anyone know of a (much) more optimised utility that can handle trial factoring of a mersenne with such a large exponant?[/QUOTE]

You can use Factor5 if you like...
MM127 has been searched deeply by Ernst Mayer with his mfactor, on whose design Factor5 is based.

Luigi

I did initially try factor5, but because the exponant was so large it didn't seem to work. It looked as if the command were treated as two separate commands. I guess that was a case of Windows tripping over itself.

I tried again now, this time by creating a status file with the start points I wanted and running factor5 with the resume switch. That works just great.

To be honest 176 bits is a fair amount deeper than I had expected MM127 to have been TFd to. Since I would need to spend quite a significant amount of CPU time to advance it much further (I estimate 38 days just to bump it up 1 bit level) I think I'll leave that idea on one side and spend my clocks on decidedly smaller exponants for now, perhaps I'll revisit the notion in a few months.

If no-one has contacted Will Edgington already, I'll send him an email in an hour or so.

[quote=lavalamp;173058]I did initially try factor5, but because the exponant was so large it didn't seem to work. It looked as if the command were treated as two separate commands. I guess that was a case of Windows tripping over itself.

I tried again now, this time by creating a status file with the start points I wanted and running factor5 with the resume switch. That works just great.

To be honest 176 bits is a fair amount deeper than I had expected MM127 to have been TFd to. Since I would need to spend quite a significant amount of CPU time to advance it much further (I estimate 38 days just to bump it up 1 bit level) I think I'll leave that idea on one side and spend my clocks on decidedly smaller exponants for now, perhaps I'll revisit the notion in a few months.

If no-one has contacted Will Edgington already, I'll send him an email in an hour or so.[/quote]
works fine for me on vista

Hm, very odd, I think it was actually a problem with the space in the .bat file, though I have no idea what it could be. I noticed that when I copied into this window a line break was included between the exponant and the start bit depth, but none was shown in notepad. Retyping the space fixed it.

i used similar to that
try widening the cmd prompt window
i have mine really wide
maybe that will stop it overflowing

3321933577 taken to 77 bits, no factors.

I've already taken 332193355 to 73 bits, now taking it to 77 bits.

[QUOTE=lavalamp;173262]3321933577 taken to 77 bits, no factors.

I've already taken 332193355 to 73 bits, now taking it to 77 bits.[/QUOTE]

You lost one digit on your last reservation... please rectify :smile:

Luigi

Sorry, must not quite have selected all the number for the copy and paste.

There's only one candidate that it could be though, 3321933551.

3321931993 from 72 to 74 bits

Luigi

Taking 3321933541 to 77.

3321933551 taken to 77 bits, no factors.

Just one more until the level ticks up now.