This research demonstrates that no k-generalized lucas number forms a palindrome with distinct repdigits for k ≥ 3, indicating new properties of the sequence.
For integers k ≥ 2, the k-generalized Lucas sequence ₙ⁽ᵏ⁾ ≥ 2-k is defined by the recurrence relation \[ L_n⁽ᵏ⁾ = Lₙ₋₁⁽ᵏ⁾ + ⋯ + Lₙ₋ₖ⁽ᵏ⁾ for n ≥ 2, \] with initial terms given by L₀⁽ᵏ⁾ = 2, L₁⁽ᵏ⁾ = 1, and L₂₋ₖ⁽ᵏ⁾ = ⋯ = L₋₁⁽ᵏ⁾ = 0. In this paper, we extend work in {Lucas} and show that the result in {Lucas} still holds for k≥ 3, that is, we show that for k≥ 3, there is no k-generalized Lucas number appearing as a palindrome formed by concatenating two distinct repdigits.
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Batte et al. (2025) studied this question.
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