Key points are not available for this paper at this time.
Let \Pₙ\₍ ₀ be the sequence of Perrin numbers defined by P₀=3, P₁=0, P₂=2 and P₍+₃=P₍+₁+P₍ for all n 0. In this paper, we determine all Perrin numbers that are palindromic concatenations of two repdigits.
Batte et al. (Tue,) studied this question.