This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A353185 #15 Jun 21 2022 22:42:23 %S A353185 10037000230509917799950,10037000240508917799950, %T A353185 10037000250507917799950,10037000260506917799950, %U A353185 10037000270505917799950,10037000280504917799950,10037000290503917799950,10037000330509817799950,10037000340508817799950 %N A353185 Numbers which require exactly 289 'Reverse and Add' steps to reach a palindrome. %C A353185 The sequence starts with 10037000230509917799950, ends with 15999771990503200073000 and contains 9031680 terms known at present, including 13968441660506503386020 and 13568441660506503386420 discovered by Anton Stefanov on January 5, 2021. %D A353185 Popular Computing (Calabasas, CA), The 196 Problem, Vol. 3 (No. 30, Sep 1975). %H A353185 Sergei D. Shchebetov, <a href="/A353185/b353185.txt">Table of n, a(n) for n = 1..10000</a> %H A353185 Jason Doucette, <a href="http://jasondoucette.com/worldrecords.html">World Records</a> %H A353185 Yutaka Nishiyama, <a href="http://www.ijpam.eu/contents/2012-80-3/9/index.html">Numerical Palindromes and the 196 Problem</a>, International Journal of Pure and Applied Mathematics, Volume 80, No. 3, 2012, 375-384. %H A353185 Sergei D. Shchebetov, <a href="https://disk.yandex.ru/d/xTtopN9Pu1O3ag">9031680 terms (zipped file)</a> %H A353185 R. Styer, <a href="http://www41.homepage.villanova.edu/robert.styer/PalindromePaper1986.pdf">The Palindromic Conjecture and the Fibonacci Sequence</a>, Villanova University, 1986, 1-11. %H A353185 C. W. Trigg, <a href="http://www.jstor.org/stable/2689178">Palindromes by Addition</a>, Mathematics Magazine, 40 (1967), 26-28. %H A353185 C. W. Trigg, <a href="http://www.jstor.org/stable/2688651">More on Palindromes by Reversal-Addition</a>, Mathematics Magazine, 45 (1972), 184-186. %H A353185 Wikipedia, <a href="https://en.wikipedia.org/wiki/Lychrel_number">Lychrel Number</a> %H A353185 196 and Other Lychrel Numbers, <a href="http://www.p196.org/">196 and Lychrel Number</a> %H A353185 <a href="https://oeis.org/wiki/Index_to_OEIS:_Section_Res#RAA">Index entries for sequences related to Reverse and Add!</a> %F A353185 Each term requires exactly 289 steps to turn into a 142-digit palindrome. %Y A353185 A023109, A033672, A065198, A065199, A065320, A065321, A065322, A065323, A065324, A065325, A065326, A065327, A070743, A072216, A072217, A072218, A281301, A281390, A281506, A281507, A326414. %K A353185 nonn,base %O A353185 1,1 %A A353185 Andrey S. Shchebetov and _Sergei D. Shchebetov_, Apr 29 2022