%I A028821
%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,
%U A028821 10000,20000,21000,29000,29790,30000,31000,31390,31621,80000,88000
%N A028821 Numbers n such that n^2 has digits in descending order.
%H A028821 P. De Geest, <a href="http://www.worldofnumbers.com/square.htm">Palindromic 
               Squares</a>
%Y A028821 Cf. A028822.
%Y A028821 Sequence in context: A080288 A047360 A004825 this_sequence A075190 A047243 
               A099148
%Y A028821 Adjacent sequences: A028818 A028819 A028820 this_sequence A028822 A028823 
               A028824
%K A028821 nonn,base
%O A028821 1,3
%A A028821 Patrick De Geest (pdg(AT)worldofnumbers.com)