Fibonacci numbers which are concatenations of two repdigits

Published in: Quaestiones Mathematicae
Volume 44 , issue 2 , 2021 , pages: 281–290

DOI: 10.2989/16073606.2019.1686439

Author(s): Adel Alahmadi , Saudi Arabia , Alaa Altassan , Saudi Arabia , Florian Luca , South Africa , Hatoon Shoaib , Saudi Arabia

Keywords: 11A25 , 11B39 , 11J86 , 11A25 , 11B39 , 11J86

We show that the only Fibonacci numbers that are concatenations of two repdigits are 13, 21, 34, 55, 89, 144, 233, 377.

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