A161770 n 1's followed by three 0's.

1000, 11000, 111000, 1111000, 11111000, 111111000, 1111111000, 11111111000, 111111111000, 1111111111000, 11111111111000, 111111111111000, 1111111111111000, 11111111111111000, 111111111111111000, 1111111111111111000, 11111111111111111000, 111111111111111111000

Offset

1,1

Comments

Sequence A159741 written in base 2.

Links

Table of n, a(n) for n=1..18.

Index entries for linear recurrences with constant coefficients, signature (11,-10).

Formula

a(n) = 1000*(10^n-1)/9 = 1000 * A002275(n).

G.f.: 1000*x/((10*x-1)*(x-1)).

Mathematica

Table[FromDigits[PadLeft[{0, 0, 0}, n, 1]], {n, 4, 20}] (* Harvey P. Dale, Aug 07 2023 *)

Crossrefs

Cf. A002275, A159741.

Sequence in context: A017511 A326639 A017643 * A004632 A277397 A250449

Adjacent sequences: A161767 A161768 A161769 * A161771 A161772 A161773

Keyword

nonn,easy,base

Author

Jaroslav Krizek, Jun 18 2009

Extensions

Edited by Charles R Greathouse IV, Oct 12 2009

Status

approved