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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 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 STATUS approved

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