English

Fibonacci and Lucas numbers as products of three repdigits in base $g$

Number Theory 2023-01-02 v1

Abstract

Recall that repdigit in base gg is a positive integer that has only one digit in its base gg expansion, i.e. a number of the form a(gm1)/(g1)a(g^m-1)/(g-1), for some positive integers m1m\geq 1, g2g\geq 2 and 1ag11\leq a\leq g-1. In the present study we investigate all Fibonacci or Lucas numbers which are expressed as products of three repdigits in base gg. As illustration, we consider the case g=10g=10 where we show that the numbers 144 and 18 are the largest Fibonacci and Lucas numbers which can be expressible as products of three repdigits respectively. All this can be done using linear forms in logarithms of algebraic numbers.

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Cite

@article{arxiv.2212.14247,
  title  = {Fibonacci and Lucas numbers as products of three repdigits in base $g$},
  author = {Kouessi Norbert Adedji and Alan Filipin and Alain Togbe},
  journal= {arXiv preprint arXiv:2212.14247},
  year   = {2023}
}

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25 pages