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Apr 2, 2017 at 18:05 comment added Daniel Loughran The constant in the closely related case of representations of integers by binary quadratic forms can be found in: Brink, Moree, Osburn - Principal forms $x^2+ny^2$ representing many integers.
Apr 2, 2017 at 18:03 comment added Daniel Loughran It is quite easy to write down the constant $C$ explicitly. One can write the associated Dirichlet series in terms of Dirichlet $L$-functions. One then obtains the asymptotic formula and thus $C$ via a Tauberian theorem ($C$ will be written in terms of special values of Dirichlet $L$-functions, which can be "calculated" using the class number formula). These methods are all explained very well in the cited paper of Serre; I would very much recommend that you study it.
Apr 2, 2017 at 16:58 comment added Tian An I'll accept the answer, though I realize now that what I was really looking for was this constant $C$ explicitly. I couldn't find this exact derivation in Landau..
Apr 2, 2017 at 16:57 vote accept Tian An
Mar 21, 2017 at 11:08 history answered Daniel Loughran CC BY-SA 3.0