A083909 Numbers of the form 10^(m-k)*(10^(m+k+1)-10^k), m, k >= 0.

9, 990, 99900, 9999000, 999990000, 99999900000, 9999999000000, 999999990000000, 99999999900000000, 9999999999000000000, 999999999990000000000, 99999999999900000000000, 9999999999999000000000000, 999999999999990000000000000, 99999999999999900000000000000

Offset

1,1

Links

Table of n, a(n) for n=1..15.

Mathematica

Table[FromDigits[Join[PadRight[{}, n, 9], PadRight[{}, n-1, 0]]], {n, 15}] (* Harvey P. Dale, Jul 25 2016 *)

Crossrefs

Cf. A006516, A079598.

Sequence in context: A361885 A368019 A112909 * A307324 A327435 A350967

Adjacent sequences: A083906 A083907 A083908 * A083910 A083911 A083912

Keyword

easy,nonn

Author

Marco Matosic, Jun 19 2003

Extensions

More terms from Harvey P. Dale, Jul 25 2016

Status

approved