ind Pn
k=0
[
n
k
]ak and Pn
k=0
s(n, k)ak.
There is also interest for k-Fibonacci polynomials. Let
Fk,n
n∈N
be a k-Fibonacci sequence. Note that if k is a real variable
x then Fk,n = Fx,n and they correspond to the Fibonacci polynomials defined by
Fn+1(x) =
(
1 if n = 0,
x if n = 1,
xFn(x) + Fn−1(x) if n > 1,
(see [11]). Actually many relations for the derivatives of Fibonacci polynomials proved in that paper. As a final sentence of
this section, we note that in the reference [12], some new properties of Fibonacci numbers with binomial coefficients have
been investigated. Actually these new properties will be needed in the proof of one of the main results.