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A010724 Period 2: repeat (6,8). 2
6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6, 8, 6 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Decimal expansion of 68/99. - David A. Corneth, Oct 18 2016

LINKS

Table of n, a(n) for n=0..80.

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

FORMULA

a(n) = (-1)^(n+1)+7 = 8*(n mod 2)+6*((n+1) mod 2). - Paolo P. Lava, Oct 27 2006

G.f.: ( -6-8*x ) / ((x-1)*(1+x)). - R. J. Mathar, Nov 21 2011

a(0)=6, a(n) = 10 - eulerphi(a(n-1)) for n>0. - Alexander R. Povolotsky, Oct 16 2016

MATHEMATICA

NestList[10 - EulerPhi@ # &, 6, 120] (* or *)

CoefficientList[Series[(-6 - 8 x)/((x - 1) (1 + x)), {x, 0, 120}], x] (* Michael De Vlieger, Oct 21 2016 *)

PROG

(PARI) a(n)=6+n%2*2 \\ Charles R Greathouse IV, Dec 08 2015

CROSSREFS

Cf. A176401.

Sequence in context: A088751 A153627 A094540 * A196822 A065356 A019797

Adjacent sequences:  A010721 A010722 A010723 * A010725 A010726 A010727

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified October 23 22:23 EDT 2019. Contains 328373 sequences. (Running on oeis4.)