Re: Mersenne: Factoring Depths

[Eric Hahn]

Dave Mullen wrote: 
I'd just like to get a clarification on some files I downloaded from the Entropia FTP.
  
Re the file of exponents, and how far they have been trial factored. 
  
I extracted a range using the decomp program. Each exponent has a number by the side, but I am unclear to what this number refers.
  
Is it 
  
a) The bitlength of the K value alone i.e. a bit length of 32 would indicate all K values 1 to (2^32) have been tested ?
  
or
  
b) The bitlength of 2 x K x Exp + 1 as computed ?
  
Just to save me repeating previously done work.
  
The answer is B.  It the length of the actual factor being
tested.  Therefore, 1139,64 means that all potential
factors thru 2^64 (18,446,744,073,709,551,615) have been
tested (all ~10^12 of them).

Eric


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Mersenne: Factoring Depths

[Dave Mullen]

I'd just like to get a clarification on some files 
I downloaded from the Entropia FTP.

Re the file of exponents, and how far they have 
been trial factored. 

I extracted a range using the decomp program. Each 
exponent has a number by the side, but I am unclear to what this number 
refers.

Is it 

a) The bitlength of the K value alone i.e. a bit 
length of 32 would indicate all K values 1 to (2^32) have been tested 
?

or

b) The bitlength of 2 x K x Exp + 1 as computed 
?

Just to save me repeating previously done 
work.

Thanks

Dave