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Oct 24, 2013 at 20:03 vote accept Marco Cantarini
Oct 23, 2013 at 7:47 comment added GH from MO @Houfei: The problem is that $\beta$ is not fixed, but depends on $q$, so the lower bound you state is much harder to achieve. Linnik managed to do this for $x>q^L$ and $L$ large (the Linnik constant), and research since has focused on lowering the value of $L$. Currently we have $L=5.2$, while the Generalized Density Hypothesis (a consequence of GRH) would allow any $L>2$.
Oct 23, 2013 at 2:03 comment added H.Flip $(3.3)$ in Andrew Granville paper in my comment implies when $q$ is small(perhaps $x>q^{1+\epsilon}$ can satisfies) $$\pi(x,q;a)\sim \frac{x-x^\beta}{\varphi(q)\log x}\ge (1-\epsilon) \frac{x}{\varphi(q)\log x}$$ where $\beta$ is real zero of $L(s,\chi) $ that is close to $1 $ with the assumption $\chi(a)=1 $ which can be omitted.
Oct 21, 2013 at 14:39 history answered GH from MO CC BY-SA 3.0