%0 Journal Article %A Rotkiewicz, A. %T On the prime factors of the number 2p-1 - 1 %J Glasgow mathematical journal %D 1968 %P 83-86 %V 9 %N 2 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089500000331/ %R 10.1017/S0017089500000331 %F 10_1017_S0017089500000331