Let ₙ≥ 0 be the sequence of Perrin numbers defined by P₀=3, P₁=0,P₂=2 and Pₙ₊₃=Pₙ₊₁+Pₙ for all n ≥ 0. In this paper, we determine all Perrin numbers that are palindromic concatenations of two repdigits.
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Batte et al. (2024) studied this question.
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