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 A035123 #35 Feb 16 2025 08:32:37 %S A035123 12,13,21,31,33,99,102,103,112,113,122,201,211,221,301,311,1002,1003, %T A035123 1011,1012,1013,1021,1022,1031,1101,1102,1103,1112,1113,1121,1122, %U A035123 1201,1202,1211,1212,1301,2001,2011,2012,2021,2022,2101,2102,2111,2121 %N A035123 Roots of 'non-palindromic squares remaining square when written backwards'. %C A035123 Those with trailing zeros are excluded. %C A035123 Union of ordered entries of A106323 and A106324. - _Lekraj Beedassy_, May 02 2005 %H A035123 Jon E. Schoenfield, <a href="/A035123/b035123.txt">Table of n, a(n) for n = 1..8448</a> (first 798 terms from Seiichi Manyama; all terms < 10^10) %H A035123 Patrick De Geest, <a href="https://www.worldofnumbers.com/nobase10pg2.htm">Palindromic Squares in bases 2 to 17</a> %H A035123 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SquareNumber.html">Square Number</a> %e A035123 1212^2 = 1468944 -> 4498641 = 2121^2. %t A035123 r[n_] := FromDigits[Reverse[IntegerDigits[n]]]; Select[Range[2200], Mod[#, 10] != 0 && IntegerQ[Sqrt[r[#^2]]] && r[#^2] != #^2 &] (* _Jean-François Alcover_, Mar 08 2011 *) %Y A035123 Cf. A035090, A035125. %K A035123 nonn,base %O A035123 1,1 %A A035123 _Patrick De Geest_, Nov 15 1998