Maximum value of ∏(1+b−ca)a is λ where a,b,c are integral sides of a triangle, λ+2 is/are divisible by
If the equations x2+2λx+λ2+1=0, λ ϵ R and ax2+bx+c=0 where a, b, c are lengths of sides of triangle have a common root, then the possible range of values of λ is