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Numbers of the form 10^(m-k)*(10^(m+k+1)-10^k), m, k >= 0.
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%I #5 Jul 25 2016 10:59:28

%S 9,990,99900,9999000,999990000,99999900000,9999999000000,

%T 999999990000000,99999999900000000,9999999999000000000,

%U 999999999990000000000,99999999999900000000000,9999999999999000000000000,999999999999990000000000000,99999999999999900000000000000

%N Numbers of the form 10^(m-k)*(10^(m+k+1)-10^k), m, k >= 0.

%t Table[FromDigits[Join[PadRight[{},n,9],PadRight[{},n-1,0]]],{n,15}] (* _Harvey P. Dale_, Jul 25 2016 *)

%Y Cf. A006516, A079598.

%K easy,nonn

%O 1,1

%A _Marco Matosic_, Jun 19 2003

%E More terms from _Harvey P. Dale_, Jul 25 2016