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Old 2004-04-08, 06:41   #1
dave_0273
 
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Default 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???
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Old 2004-04-08, 08:29   #2
nuutti
 
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Quote:
Originally Posted by 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???
I think that you need savefile from person who did original p-1 factoring.
So answers is practically no.

nuutti
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Old 2004-04-08, 11:24   #3
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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.

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Old 2004-04-08, 12:55   #4
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Wouldn't it just be B1 - and that can be found in pminus1.txt that comes out in the weekly files??
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Old 2004-04-08, 13:06   #5
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Quote:
Originally Posted by dave_0273
Wouldn't it just be B1 - and that can be found in pminus1.txt that comes out in the weekly files??
As described on the math page http://www.mersenne.org/math.htm, stage 1 calculates 3 raised to a large power mod the Mersenne number. Stage 2 requires this residue to work.
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