%I A053898
%S A053898 1,2,12,21,38,88,2729,2036462,2678521,1203108962
%N A053898 Numbers n such that n^2 contains only digits {1,4,7}.
%H A053898 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 A053898 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 A053898 Cf. A053899.
%Y A053898 Sequence in context: A048955 A034049 A073041 this_sequence A058413 A053890 
               A053896
%Y A053898 Adjacent sequences: A053895 A053896 A053897 this_sequence A053899 A053900 
               A053901
%K A053898 nonn,base,more
%O A053898 1,2
%A A053898 Patrick De Geest (pdg(AT)worldofnumbers.com), Mar 15 2000.
%E A053898 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 04 2005