Zagier’s well-known work on traces of singular moduli relates the coefficients of certain weakly holomorphic modular forms of weight 1 2 to traces of values of the modular j-function at imaginary quadratic points. A real quadratic analogue was recently studied by Duke, Imamo¯glu, and T´oth. They showed that the coefficients of certain weight 1/2 mock modular forms fD =d>0a(d,D)qd, D>0 ar…