%0 Journal Article %A Anderson, Ian %T A concavity problem in number theory %J Glasgow mathematical journal %D 1971 %P 10-11 %V 12 %N 1 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089500001075/ %R 10.1017/S0017089500001075 %F 10_1017_S0017089500001075