%0 Journal Article %A P. TurĂ¡n %T On a problem of E. Landau %J Acta Arithmetica %D 1980 %P 297-313 %V 36 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-36-3-297-313/ %R 10.4064/aa-36-3-297-313 %G de %F 10_4064_aa_36_3_297_313