Editing Numerical digit (section)

===Palindromic numbers and Lychrel numbers===
{{main|Palindromic number}}
Palindromic numbers are numbers that read the same when their digits are reversed.<ref>{{Cite web|last=Weisstein|first=Eric W.|title=Palindromic Number|url=https://mathworld.wolfram.com/PalindromicNumber.html|access-date=2020-07-22|website=mathworld.wolfram.com|language=en}}</ref> A [[Lychrel number]] is a positive integer that never yields a palindromic number when subjected to the iterative process of being added to itself with digits reversed.<ref>{{Cite web|last=Weisstein|first=Eric W.|title=Lychrel Number|url=https://mathworld.wolfram.com/LychrelNumber.html|access-date=2020-07-22|website=mathworld.wolfram.com|language=en}}</ref> The question of whether there are any Lychrel numbers in base&nbsp;10 is an open problem in [[recreational mathematics]]; the smallest candidate is [[196 (number)|196]].<ref>{{Cite book|last1=Garcia|first1=Stephan Ramon|url=https://books.google.com/books?id=7qCdDwAAQBAJ&q=Lychrel+196&pg=PA104|title=100 Years of Math Milestones: The Pi Mu Epsilon Centennial Collection|last2=Miller|first2=Steven J.|date=2019-06-13|publisher=American Mathematical Soc.|isbn=978-1-4704-3652-0|pages=104–105|language=en}}</ref>