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\bibitem{bib5} U. Kolpakov, G. Kulcherov. \textsl{Searching for gapped palindromes}. Theor. Comput. Sci. 410, P. 5365-5373 (2009);\\

\bibitem{bib6} C. Trigg. \textsl{Palyindromes by addition}. Mathematic Magazine, Vol 40, (1967);

\bibitem{bib7} W. VanLandingham. \textsl{"196 and Other Lychrel Numbers"}. http://www.p196.org/. (2006);

\bibitem{bib8} D. Wilson. \textsl{https://oeis.org/A0231". From Mathworld-A Wolfram Web Resource. https://mathworld.wolfram.com/196-Algorithm.html.(2008)};

\bibitem{bib9} J. Walker. \textsl{Three Years of Computing: Final Report on a Palindrome Quest}, (1987) \textsl{http://www.fourmilab.ch/documents/threeyears/threeyears.html.};
    
\bibitem{bib10}\textsl{Nombre de Lychrel sur dCode.fr [site web en ligne]}. \textsl{https://www.dcode.fr/nombre-Lychrel};

\bibitem{bib11} Project Euler 55. \textsl{https://www.mathblog.dk/project-euler-55-how-many-lychrel-numbers-are-there-below-ten-thousand/}.
\end{thebibliography}