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 A028821 #15 Feb 10 2025 21:32:15 %S A028821 0,1,2,3,8,9,10,20,21,29,30,31,80,88,90,100,200,210,290,300,310,800, %T A028821 880,900,1000,2000,2100,2900,2979,3000,3100,3139,8000,8800,9000,10000, %U A028821 20000,21000,29000,29790,30000,31000,31390,31621,80000,88000 %N A028821 Numbers k such that k^2 has digits in nonincreasing order. %H A028821 Ray Chandler, <a href="/A028821/b028821.txt">Table of n, a(n) for n = 1..108</a> %H A028821 Patrick De Geest, <a href="https://www.worldofnumbers.com/nobase10pg2.htm">Palindromic Squares in bases 2 to 17</a> %t A028821 Select[Range[0,10^5],GreaterEqual@@IntegerDigits[#^2]&] (* _Ray Chandler_, Jan 05 2014 *) %Y A028821 Cf. A028822. %K A028821 nonn,base %O A028821 1,3 %A A028821 _Patrick De Geest_ %E A028821 Better name from _Ray Chandler_, Jan 05 2014