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Old 2015-06-19, 05:48   #1
rwwh
 
"Rob Hooft"
Jun 2015
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Default Group order not accepted for some GMP-ECM factors?

I normally upload any factorizations I find using GMP-ECM to factordb. Once in a while it does not want to accept the ECM report and tells me to check the results because the group order does not fit B1/B2.

Does this have anything to do with the Brent-Suyama's extension? And is there anything I should do to make sure the ECM results are accepted?
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Old 2015-06-19, 06:10   #2
Batalov
 
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"Serge"
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One easy trick to do is add an extra zero to B2; it will most likely be accepted then.
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Old 2015-06-19, 06:26   #3
axn
 
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Jun 2003

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Factordb itself has a group order calculator (http://www.factordb.com/groupcalc.php). You can use that to check if that is the issue, and the fudge B2 (and/or B1) accordingly.
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