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Oct 10, 2015 at 12:51 vote accept Konstantinos Gaitanas
Oct 10, 2015 at 11:13 comment added Ilya Bogdanov Surely. I just wanted to emphasize that we do not need to determine this prime explicitly.
Oct 10, 2015 at 11:12 comment added მამუკა ჯიბლაძე I see, thanks. One minor remark - one hardly needs any theorems nowadays to check that $13$ does not divide $2^i-1$ for $i<12$ :)
Oct 10, 2015 at 10:43 history edited Ilya Bogdanov CC BY-SA 3.0
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Oct 10, 2015 at 9:13 history answered Ilya Bogdanov CC BY-SA 3.0