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%I #8 Oct 20 2019 12:47:53
%S 155,274,2191,104579630,142857142,189126664,195488721,241758243,
%T 280035755
%N Numbers n such that decimal expansion of n^2 has the form D 0 (D+1) for some number D.
%C No more terms < sqrt(5)*10^9. - _David Wasserman_, Aug 31 2005
%e 2191^2=4800481 = 480 0 481
%t Select[Table[Sqrt[FromDigits[Join[IntegerDigits[n],{0},IntegerDigits[ n+1]]]],{n,785*10^5}],IntegerQ] (* _Harvey P. Dale_, Oct 20 2019 *)
%K nonn,base
%O 1,1
%A _Yalcin Aktar_, Dec 12 2003
%E More terms from _David Wasserman_, Aug 31 2005