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Old 2010-12-08, 00:51   #1
Brain
 
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Dec 2009
Peine, Germany

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Default ECM curve group order

It may be a dumb question but I haven't found the answer yet:
Given: ECM factoring result: 2^exponent-1,B1, B2, Sigma, Factor found
Needed: Group order of the ecm curve (not the factor itsself)
What is the fastest way / best program to the the ecm group order?
All I have found is this.
A hint would be appreciated. Thanks.
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Old 2010-12-08, 01:00   #2
fivemack
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Feb 2006
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Default

http://www.mersenneforum.org/showthread.php?t=14184

put in your p and sigma then copy-and-paste the code in the box into the box on http://magma.maths.usyd.edu.au/calc/
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