%I A053885
%S A053885 1,121,2217121,21127711127121,17177711172112177722222121,
%T A053885 17117772217211221211117217772227121
%N A053885 Squares composed of digits {1,2,7}.
%H A053885 P. De Geest, <a href="http://www.worldofnumbers.com/threedigits.htm">
               Squares containing at most three distinct digits, Index entries for 
               related sequences</a>
%H A053885 Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/
               math02/math0210.htm#127">Sporadic tridigital solutions</a>
%Y A053885 Cf. A053884.
%Y A053885 Sequence in context: A082215 A123179 A136094 this_sequence A068490 A077735 
               A068121
%Y A053885 Adjacent sequences: A053882 A053883 A053884 this_sequence A053886 A053887 
               A053888
%K A053885 nonn,base,more
%O A053885 1,2
%A A053885 Patrick De Geest (pdg(AT)worldofnumbers.com), Mar 15 2000.
%E A053885 One more term from Jon E. Schoenfield (jonscho(AT)hiwaay.net), Sep 03 
               2006
%E A053885 One more term from Herman Jamke (hermanjamke(AT)fastmail.fm), Dec 23 
               2007