> Hi,
> On one of my computers I used version 23.7 until a few days ago, when I
> upgraded to 24.14. It is running a factoring of M40176839. Version 23.7
> wanted to factor it to 2^69, version 24.14 to 2^68.
> Can anybody explain what's going on?
>
> Norbert
>
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>
The reason is that during the last few years, the Lucas-Lehmer test has
been optimised more than the factoring has, so recently the division of
work between factoring and Lucas-Lehmer testing hasn't been optimal. (The
effort of doing that last bit of factoring would save too little
Lucas-Lehmer work on average.) This was fixed in version 24.12.
Patrik
>From whatsnew.txt:
New features in Version 24.12 of prime95.exe
--------------------------------------------
[---]
3) The factoring breakeven points have been recalculated using my 2 GHz P4.
This version of prime95 will do less trial factoring.
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