In this paper, we investigate the existence and uniqueness of
solutions for a coupled system of Caputo (Liouville-Caputo) type
sequential fractional differential equations with variable
coefficients supplemented with coupled nonlocal Riemann-Liouville
integral boundary conditions. We make use of standard tools of the
fixed-point theory to obtain the desired results. Our results are
new and give more insight into the study of coupled systems of
fractional differential equations with non-constant coefficients.
Examples are included for the illustration of main results.