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A180593 Digital root of 3n. 7
0, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6, 9, 3, 6 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(n+1) = 3*A010882(n). [From Reinhard Zumkeller, Oct 25 2010]

LINKS

Table of n, a(n) for n=0..86.

FORMULA

G.f.: (-3*(1 + 2*x + 3*x^2))/(-1 + x^3) for n>0. - Alexander R. Povolotsky, Jun 13 2012

MATHEMATICA

digitalRoot[n_Integer?Positive] := FixedPoint[Plus@@IntegerDigits[#]&, n]; Table[If[n==0, 0, digitalRoot[3*n]], {n, 0, 200}] (* Vladimir Joseph Stephan Orlovsky, May 02 2011 *)

CROSSREFS

Cf. A180592, A180594, A180595, A180596, A180597, A180598, A180599. [From Robert G. Wilson v, Sep 20 2010]

Sequence in context: A099679 A013663 A245223 * A271742 A195771 A086276

Adjacent sequences:  A180590 A180591 A180592 * A180594 A180595 A180596

KEYWORD

nonn,base

AUTHOR

Odimar Fabeny, Sep 10 2010

EXTENSIONS

Edited by N. J. A. Sloane, Sep 23 2010

STATUS

approved

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Last modified March 29 05:39 EDT 2020. Contains 333105 sequences. (Running on oeis4.)