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Apr 26, 2013 at 13:07 comment added GH from MO @Krishnan: I don't think there is an English translation, but the quoted result should be available in many textbooks. Also, I think it is very simple to show that $r_Q^*(n)$ is at most the number of solutions of the congruence, you don't need a reference for that.
Apr 26, 2013 at 11:52 comment added Krishnan Rajkumar Thanks for the reference! Seems like a delightful book - Are there any English translations available? As for the answer, Buell said the same thing about primitive representations, except that this was number of classes of forms. To get the actual number of primitive integer solutions within each class, one might have to apply modular transformations - but that will only scale up the answer by a constant factor.
Apr 26, 2013 at 0:33 vote accept Krishnan Rajkumar
Apr 25, 2013 at 23:22 history edited GH from MO CC BY-SA 3.0
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Apr 25, 2013 at 20:57 history edited GH from MO CC BY-SA 3.0
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Apr 25, 2013 at 19:50 history answered GH from MO CC BY-SA 3.0