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Apr 13, 2017 at 12:58 history edited CommunityBot
replaced http://mathoverflow.net/ with https://mathoverflow.net/
Apr 28, 2016 at 17:08 vote accept Yusuf Gurtas
Apr 28, 2016 at 17:07 comment added Yusuf Gurtas Thanks for the link maths.lancs.ac.uk/~jameson/cyp.pdf . Theorem 2.5 there answers my question, hence the question asked by @Alex. In fact not only one but all divisors of $\Phi_n(2)$ greater than $n$ are of the form $kn+1$ according to that theorem. It also characterizes the divisors less than $n$. Actually my question is $a=2$ case of that theorem.
Apr 27, 2016 at 23:17 comment added Gerhard Paseman Another recent paper which may be of interest is Granville's arxiv.org/abs/1212.6306 , which contains references to further generalizations/relations of Zsigmondy's theorem. Gerhard "Where One Learns Primitive Factors" Paseman, 2016.04.27.
Apr 27, 2016 at 19:51 history answered Gerhard Paseman CC BY-SA 3.0