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 A129969 #6 Dec 01 2024 14:30:27 %S A129969 1,2,3,1,11,21,31,2,12,22,3,13,1,101,201,301,11,111,211,311,21,121, %T A129969 221,31,2,102,202,12,112,212,22,122,3,103,13,113,1,1001,2001,3001,101, %U A129969 1101,2101,3101,201,1201,2201,301,1301,11,1011,2011 %N A129969 a(n) = A061909(n) with digits reversed. %H A129969 T. D. Noe, <a href="/A129969/b129969.txt">Table of n, a(n) for n=1..5000</a> %t A129969 Rest[IntegerReverse/@Select[Range[0,1200],IntegerReverse[#^2]==IntegerReverse[#]^2&]] (* _Harvey P. Dale_, Dec 01 2024 *) %K A129969 nonn,base %O A129969 1,2 %A A129969 _N. J. A. Sloane_, Jun 13 2007