%0 Journal Article %A Toyokazu Hiramatsu %A Yoshio Mimura %T On numbers of type $x^{2} + Ny^{2}$ %J Acta Arithmetica %D 1990 %P 271-277 %V 56 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-56-3-271-277/ %R 10.4064/aa-56-3-271-277 %G en %F 10_4064_aa_56_3_271_277