%I A016069
%S A016069 4,5,6,7,8,9,10,11,12,15,20,21,22,26,30,38,88,100,109,173,200,212,
%T A016069 235,264,300,1000,2000,3000,3114,10000,20000,30000,81619,100000,
%U A016069 200000,300000,1000000,2000000,3000000,10000000,20000000
%N A016069 Numbers n such that n^2 contains exactly 2 different digits.
%D A016069 R. K. Guy, Unsolved Problems in Number Theory, F24.
%H A016069 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               SquareNumber.html">See also</a>
%Y A016069 Cf. A016070, A018884, A018885.
%Y A016069 Sequence in context: A111222 A037357 A039174 this_sequence A039128 A162706 
               A088331
%Y A016069 Adjacent sequences: A016066 A016067 A016068 this_sequence A016070 A016071 
               A016072
%K A016069 nonn,easy,base,nice
%O A016069 1,1
%A A016069 Robert G. Wilson v (rgwv(AT)rgwv.com)