on some frobenius groups with the same prime graph as the almost simple group pgl(2, 49)

The prime graph of a finite group g is denoted by γ(g) whose vertex set is π(g) and two distinct primes p and q are adjacent in γ(g), whenever g contains an element with order pq. we say that g is nrecognizable by prime graph if there is a finite group h with γ(h)=γ(g), in while h≆g. in this paper, we consider finite groups with the same prime graph as the almost simple group pgl(2,49). moreover, we construct some frobenius groups whose prime graphs coincide with γ(pgl(2,49)), in particular, we get that pgl(2,49) is unrecognizable by its prime graph.