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-   -   P-1 Stage 2 (https://www.mersenneforum.org/showthread.php?t=2339)

dave_0273 2004-04-08 06:41

P-1 Stage 2
 
I don't really know if this is in the right place, so feel free to move it if it isn't.

I was wondering if there was any way that just stage 2 of p-1 factoring can be repeated. A lot of exponents have had stage 1 done, but little or no stage 2. Is there any way of picking up where they left off, by just doing stage 2???

nuutti 2004-04-08 08:29

[QUOTE=dave_0273]I don't really know if this is in the right place, so feel free to move it if it isn't.

I was wondering if there was any way that just stage 2 of p-1 factoring can be repeated. A lot of exponents have had stage 1 done, but little or no stage 2. Is there any way of picking up where they left off, by just doing stage 2???[/QUOTE]
I think that you need savefile from person who did original p-1 factoring.
So answers is practically no.

nuutti

ET_ 2004-04-08 11:24

IIRC, stage 2 depends on bounds defined in stage 1, but low or no information is given on which bound has been used on each P-1 test.

Luigi

dave_0273 2004-04-08 12:55

Wouldn't it just be B1 - and that can be found in pminus1.txt that comes out in the weekly files??

nfortino 2004-04-08 13:06

[QUOTE=dave_0273]Wouldn't it just be B1 - and that can be found in pminus1.txt that comes out in the weekly files??[/QUOTE]

As described on the math page [url]http://www.mersenne.org/math.htm[/url], stage 1 calculates 3 raised to a large power mod the Mersenne number. Stage 2 requires this residue to work.


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