%I A058471
%S A058471 3,9949370777987917
%N A058471 Numbers n such that n^2 contains only digits {7,8,9}.
%H A058471 P. De Geest, <a href="http://www.worldofnumbers.com/threedigits.htm">
               Index to related sequences</a>
%H A058471 Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/
               math02/math0210.htm#789">Sporadic tridigital solutions</a>
%Y A058471 Cf. A058472.
%Y A058471 Sequence in context: A036236 A058447 A058453 this_sequence A068740 A058473 
               A115527
%Y A058471 Adjacent sequences: A058468 A058469 A058470 this_sequence A058472 A058473 
               A058474
%K A058471 nonn,base,hard,more,bref
%O A058471 1,1
%A A058471 Patrick De Geest (pdg(AT)worldofnumbers.com), Nov 15 2000.