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Published online by Cambridge University Press: 22 January 2016
For an integer d > 0 (resp. d < 0) let hd denote the number of Sl 2(Z)-equivalence classes of primitive (resp. primitive positive-definite) integral binary quadratic forms of discriminant d. For
where t and u are the smallest positive integral solutions of the equation t 2 − du 2 = 4 if d is a non-square and εd = 1 if d is a square.
Research supported by SFB-170, Göttingen, Germany and by a Fulbright fellowship