
9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9
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OFFSET

0,1


COMMENTS

The digital root of 9^n gives the sequence 1,9,9,9,9,...  Cino Hilliard, Dec 31 2004
Continued fraction expansion of (9+sqrt(85))/2.  Bruno Berselli, Mar 15 2011


LINKS

Table of n, a(n) for n=0..80.
Tanya Khovanova, Recursive Sequences
INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 1017
A. Norton, Michael Baldwin, Does 0.999... really equal 1?, The Math Educ. 21 (2) (2012) 5867.
Index to divisibility sequences
Index entries for linear recurrences with constant coefficients, signature (1).


FORMULA

G.f.: 9/(1x).  Bruno Berselli, Mar 15 2011
Equals A158289(n) + A199264(n). [Arkadiusz Wesolowski, Nov 30 2011]
E.g.f.: 9*e^x.  Vincenzo Librandi, Jan 26 2012


MATHEMATICA

Table[9, {81}] (* Arkadiusz Wesolowski, Nov 30 2011 *)


PROG

(PARI) a(n)=9 \\ Charles R Greathouse IV, Oct 07 2015


CROSSREFS

Sequence in context: A099646 A181693 A271880 * A180599 A291092 A066568
Adjacent sequences: A010731 A010732 A010733 * A010735 A010736 A010737


KEYWORD

nonn,easy


AUTHOR

N. J. A. Sloane.


STATUS

approved

