In this paper, we prove that there is no x ≥ 4 such that the difference of x-th powers of two consecutive Fibonacci numbers greater than 0 is a Lucas number. Also we show that the Diophantine equationLr with l ∈ {2, 3, 4} , n > 0, and r ≥ 0 has no solutions for x ≥ 4. Finally, we conjecture that the Diophantine equationLr with (n, m) = (1, 0), (2, 0), and r ≥ 0 has no solutions for x ≥ 4.