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 A029991 #17 Feb 10 2025 20:02:28 %S A029991 0,1,4,49,1369,1849,5776,8281,47089,67081,1132096,1682209,1776889, %T A029991 2307361,2418025,7311616,11336689,60481729,64464841,82428241, %U A029991 389944009,2176875649,2197078129,2302944121,2323722025,2963604721 %N A029991 Squares which are palindromes in base 6. %H A029991 Seiichi Manyama, <a href="/A029991/b029991.txt">Table of n, a(n) for n = 1..92</a> %H A029991 Patrick De Geest, <a href="https://www.worldofnumbers.com/nobase10pg2.htm">Palindromic Squares in bases 2 to 17</a> %F A029991 a(n) = A029990(n)^2. - _Seiichi Manyama_, Oct 16 2021 %Y A029991 Squares which are palindromes in base b: A029983 (b=2), A029985 (b=3), A029987 (b=4), A029989 (b=5), this sequence (b=6), A029993 (b=7), A029806 (b=8), A029995 (b=9), A002779 (b=10), A029997 (b=11), A029738 (b=12), A029999 (b=13), A030074 (b=14), A030075 (b=15), A029734 (b=16). %Y A029991 Cf. A029990. %K A029991 nonn,base %O A029991 1,3 %A A029991 _Patrick De Geest_