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Fibonacci numbers as mixed concatenations of Fibonacci and Lucas numbers

  • Alaa Altassan and Murat Alan EMAIL logo
Published/Copyright: June 24, 2024
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Abstract

Let (Fn)n≥0 and (Ln)n≥0 be the Fibonacci and Lucas sequences, respectively. In this paper we determine all Fibonacci numbers which are mixed concatenations of a Fibonacci and a Lucas numbers. By mixed concatenations of a and b, we mean the both concatenations ab and ba together, where a and b are any two nonnegative integers. So, the mathematical formulation of this problem leads us searching the solutions of two Diophantine equations Fn = 10d Fm + Lk and Fn = 10d Lm + Fk in nonnegative integers (n, m, k), where d denotes the number of digits of Lk and Fk, respectively. We use lower bounds for linear forms in logarithms and reduction method in Diophantine approximation to get the results.

MSC 2010: Primary 11B39; 11J86
  1. Communicated by István Gaál

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Received: 2022-09-23
Accepted: 2023-09-04
Published Online: 2024-06-24
Published in Print: 2024-06-25

© 2024 Mathematical Institute Slovak Academy of Sciences

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