[B]VBCurtis[/B] is correct, GNFS would be pretty quick. You're almost there with the sqrt.

You can run the sqrt in parallel if you have idle cores. Something like:
[CODE]./msieve -nc3 11,13
./msieve -nc3 14,16
./msieve -nc3 17,19
...[/CODE]
You might want to use a different folder for each or point them to a different log file so you won't intersperse the output of each run.

[QUOTE=RichD;559795]You can run the sqrt in parallel if you have idle cores. Something like:
[CODE]./msieve -nc3 11,13
./msieve -nc3 14,16
./msieve -nc3 17,19
...[/CODE]You might want to use a different folder for each or point them to a different log file so you won't intersperse the output of each run.[/QUOTE]Interesting!

:tu:

Thanks guys, my message was before going to bed so I left msieve running, results here: [url]https://www.mersenneforum.org/showpost.php?p=559831&postcount=33[/url]