(on composition factors of a group with the same prime graph as ln(5

Abstract. the prime graph of a nite group g is denoted by??(g). a nonabelian simple group g is called quasirecognizable byprime graph if, for every nite group h, where ??(h) = ??(g), thereexists a nonabelian composition factor of h that is isomorphic tog. until now, it has been proved that some nite linear simplegroups are quasirecognizable by prime graph, for instance, the lin-ear groups ln(2) and ln(3) are quasirecognizable by prime graph.in this paper, we consider the quasirecognition by prime graph ofthe simple group ln(5).