%0 Journal Article %A Indar Luthar %T A generalization of a theorem of Landau %J Acta Arithmetica %D 1966 %P 223-228 %V 12 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-12-3-223-228/ %R 10.4064/aa-12-3-223-228 %G en %F 10_4064_aa_12_3_223_228