  We study the factorization of four dimensional N=1 superconformal index for
U(N) (SU(N)) SQCD with N_F fundamental and anti-fundamental chiral multiplets.
When both the anomaly free R-charge assignment and the traceless condition for
total vorticities are satisfied, we find that the superconformal index
factorizes to a pair of the elliptic uplift of the vortex partition functions.
We also study the relation between open topological string and the the elliptic
uplift of the vortex partition functions. In the three dimensional limit, we
show index for U(N) theory reduces to the factorized form of the partition
function on the three dimensional squashed sphere.
