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Old 2020-09-18, 01:51   #9
baih
 
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Jun 2019

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I DONT try to facto 2^1277-1 BY 2^1277-2
because i know the possibilty to find a large gcf(a-1,b-1) is very very small (excluded)
approximately the gcf < 10 digts it wont do anything if the factor is large

but this does not mean that the method is incorrect
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