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Old 2020-11-04, 04:00   #2
Batalov's Avatar
Mar 2008

943110 Posts

Originally Posted by bbb120 View Post
he find the factor of 7^337+1,
I check it with sigma 3882127693,but it works very slow on my computer with one elliptic curve ,how long did he cost to get that factor ?
Use this "3rd" website -
then click on green arrow next to "ECM" ... or here,
then click on the link to order value of the curve, then you will find that with this sigma you can use B1 = 115e7 and B2 = 8e12.

This will save you a lot of running time to confirm that this is the correct factor by ECM.

Of course you can also check that it is indeed a factor much faster.
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