%0 Journal Article %A Firoozbakht, Farideh %A Hasler, Maximilian F. %T Variations on Euclid's formula for perfect numbers %J Journal of integer sequences %D 2010 %V 13 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/JIS_2010__13_3_a3/ %G en %F JIS_2010__13_3_a3