A057933 Floor[(80/81)*10^n].

9, 98, 987, 9876, 98765, 987654, 9876543, 98765432, 987654320, 9876543209, 98765432098, 987654320987, 9876543209876, 98765432098765, 987654320987654, 9876543209876543, 98765432098765432, 987654320987654320

Offset: 1

Author

Henry Bottomley, Oct 04 2000

Keywords

• nonn

Links

• Index entries for linear recurrences with constant coefficients, signature (10,0,0,0,0,0,0,0,1,-10).

Crossrefs

Cf. A057932.

Programs

Mathematica

Floor[80/81*10^Range[20]] (* Harvey P. Dale, May 28 2017 *)

PARI

a(n)=10^n*80\81

Formula

G.f.:(9x+8x^2+7x^3+6x^4+5x^5+4x^6+3x^7+2x^8)/((1-10x)(1-x^9)).

a(n)=10*a(n-1)-(n%9)+10*(n%9!=0).