A180598 Digital root of 8n.

0, 8, 7, 6, 5, 4, 3, 2, 1, 9, 8, 7, 6, 5, 4, 3, 2, 1, 9, 8, 7, 6, 5, 4, 3, 2, 1, 9, 8, 7, 6, 5, 4, 3, 2, 1, 9, 8, 7, 6, 5, 4, 3, 2, 1, 9, 8, 7, 6, 5, 4, 3, 2, 1, 9, 8, 7, 6, 5, 4, 3, 2, 1, 9, 8, 7, 6, 5, 4, 3, 2, 1, 9, 8, 7, 6, 5, 4, 3, 2, 1, 9, 8, 7, 6, 5, 4, 3, 2, 1, 9, 8, 7, 6, 5, 4, 3, 2, 1, 9, 8, 7, 6, 5, 4

Offset

0,2

Comments

Period of 9. - Robert G. Wilson v, Sep 20 2010

Essentially the same as A138531. - R. J. Mathar, Jul 09 2011

Links

Table of n, a(n) for n=0..104.

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

Formula

G.f.: -x*(9*x^8+x^7+2*x^6+3*x^5+4*x^4+5*x^3+6*x^2+7*x+8)/((x-1)*(x^2+x+1)*(x^6+x^3+1)). - Colin Barker, Aug 19 2012

Mathematica

f[n_] := Mod[8 n - 1, 9] + 1; f[0] = 0; Array[f, 105, 0] (* Robert G. Wilson v, Sep 20 2010 *)

Crossrefs

Cf. A007953, A010888, A180592 - A180599.

Sequence in context: A161813 A284809 A104347 * A262703 A031311 A344383

Adjacent sequences: A180595 A180596 A180597 * A180599 A180600 A180601

Keyword

easy,nonn,base

Author

Odimar Fabeny, Sep 10 2010

Extensions

More terms from Robert G. Wilson v, Sep 20 2010

Status

approved