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Jan 28, 2016 at 2:50 comment added Joe Silverman @Lucia I stated Siegel's theorem precisely and then prefaced the rest of the post with "at least approximately." The poster is looking at experimental data, so rather than guessing a bound of $p^{\sqrt p}$, he'd be better off first trying to estimate the growth rate of the upper bound for $\log|x_0|$, which would hide some of the lower order phenomena. Then, as you say, one should be able to guess $\gg\ll p^{1/2\pm\epsilon}$. Following Siegel blindly and pretending lower order terms don't exist gives what I wrote; I made no claim it was accurate. Thanks for being more precise.
Jan 27, 2016 at 23:28 comment added Lucia You only get from this a bound of $\exp(p^{1/2+\epsilon})$. Please see argument in my answer below.
Jan 27, 2016 at 21:52 vote accept Will Jagy
Jan 27, 2016 at 23:55
Jan 27, 2016 at 21:39 history answered Joe Silverman CC BY-SA 3.0