On generalized Thabit numbers $(p+1)p^{\mathfrak{a}}-1$ in the $k$-Lucas sequence

Abstract

Let $k\ge 2$ and $\{L_n^{(k)}{\}}_{n\ge 2-k}$ be the sequence of $k$-Lucas numbers whose first $k$ terms are $0,\dots ,0,2,1$ and each term afterwards is the sum of the preceding $k$ terms. In this paper, we solve the Diophantine equation $L_n^{(k)}=(p+1)p^{\mathfrak{a}}-1$, for a Mersenne or Fermat prime $p=2^{\ell }\pm 1$, and positive integers $n\ge 2$, $k\ge 2$, $\mathfrak{a}\ge 1$ and $\ell \ge 1$.

arXiv comment17 pages