%I A053880
%S A053880 1,2,11,12,21,38,338,1488,3338,11011,20521,33338,210771,333338,3333338,
%T A053880 14636332,15570521,20279162,33333338,45947921,49136668,66641662,
%U A053880 333333338,648940838,3333333338,6412661079,14632642079,33333333338
%N A053880 Numbers n such that n^2 contains only digits {1,2,4}.
%H A053880 Author?, <a href="http://blue.kakiko.com/mmrmmr/htm/eqtn06.html">Source</
               a>(<a href="http://blue.kakiko.com/mmrmmr/txt/eqtn06.txt">txt</a>
               )
%H A053880 P. De Geest, <a href="http://www.worldofnumbers.com/threedigits.htm">
               Squares containing at most three distinct digits, Index entries for 
               related sequences</a>
%Y A053880 Cf. A053881.
%Y A053880 Sequence in context: A007931 A136407 A136999 this_sequence A063112 A038113 
               A089600
%Y A053880 Adjacent sequences: A053877 A053878 A053879 this_sequence A053881 A053882 
               A053883
%K A053880 nonn,base
%O A053880 1,2
%A A053880 Patrick De Geest (pdg(AT)worldofnumbers.com), Mar 15 2000.
%E A053880 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005