%I A053884
%S A053884 1,11,1489,4596489,4144600242739,130834904430015239
%N A053884 Numbers n such that n^2 contains only digits {1,2,7}.
%H A053884 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 A053884 Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/
               math02/math0210.htm#127">Sporadic tridigital solutions</a>
%Y A053884 Cf. A053885.
%Y A053884 Sequence in context: A015027 A160264 A076168 this_sequence A027880 A028453 
               A024151
%Y A053884 Adjacent sequences: A053881 A053882 A053883 this_sequence A053885 A053886 
               A053887
%K A053884 nonn,base,more
%O A053884 1,2
%A A053884 Patrick De Geest (pdg(AT)worldofnumbers.com), Mar 15 2000.
%E A053884 One more term from Jon E. Schoenfield (jonscho(AT)hiwaay.net), Sep 03 
               2006
%E A053884 One more term from Herman Jamke (hermanjamke(AT)fastmail.fm), Dec 23 
               2007