done with 43980, 111 digits, 2^6*3 driver

taking 40872

41784: i889, size 111, [COLOR=Red]2^5*3*7[/COLOR]

Releasing 40500 and 40722

Reserving 40518, 40866

Unreserving 40096 at i=2421, size 116, [COLOR="Red"]2^3*3[/COLOR]. (the driver had changed from [COLOR="Red"]2^4*3*31[/COLOR] directly to [COLOR="Red"]2^3*3[/COLOR] in line 2373.)

[B]Reserving 40224.[/B]

done with 40872, 2^6*5 driver
taking 42312

[QUOTE=firejuggler;216981]done with 40872, 2^6*5 driver[/QUOTE]

Actually it's 2^6*127, which is a very nasty driver.

871 say 2^6*5*127... i suppose you ommit 5 cause 2^6>5?
or because 870 is 2^6*127...
(sorry for all the question i'm still learning)
and now 2^6*5^2*127 for 875
(at the time of first post was finishing 871)

[QUOTE=firejuggler;216997]871 say 2^6*5*127... i suppose you ommit 5 cause 2^6>5?
or because 870 is 2^6*127...
(sorry for all the question i'm still learning)
and now 2^6*5^2*127 for 875
(at the time of first post was finishing 871)[/QUOTE]

The driver isn't always just the smallest factors, especially when dealing with 2^6*127. The driver in these cases is still 2^6*127, even though it also has a 5^2 factor. The 5^2 factor isn't part of the driver, it just makes the sequence grow quicker as long as it's in there.
A list of drivers is at:
[url]http://mersennewiki.org/index.php/Aliquot_Sequences[/url]

so, not only does it have a 'perfect' driver (the worst of them), but the 5^2 make it even worse?

[QUOTE=firejuggler;217006]so, not only does it have a 'perfect' driver (the worst of them), but the 5^2 make it even worse?[/QUOTE]

Yep. Fortunately, since it's not part of the driver, the 5^2 is unstable (i.e. it's likely to go away at any time).