3 Particular identities involving k-Pell and k-Pell-Lucas
numbers
In this section, we consider two identities involving both k-Pell and
k-Pell-Lucas numbers and we use them in the next section in order to find the nth
power of the generating matrix for the k-Pell-Lucas sequence. First, we recall the
Binet’s formula for k-Pell-Lucas sequence,
Proposition 2 (Binet’s formula): [Proposition 1, in Catarino et al. [14]]
The n k-Pell-Lucas number is given by
where
are the roots of the characteristic equation
associated to the recurrence relation (2)
Using Binet’s formulas (4) and (5), we obtain the first identity involving the
sequences referred.