A131719 Period 6: repeat [0, 1, 1, 1, 1, 0].

0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0

Offset

0,1

Links

Table of n, a(n) for n=0..107.

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

Formula

G.f.: -(x^2+1)*x/(x-1)/(x^2+x+1)/(x^2-x+1). - R. J. Mathar, Nov 14 2007

a(n) = 2/3-cos(Pi*n/3)/2+sqrt(3)*sin(Pi*n/3)/6 -cos(2*Pi*n/3)/6 +sqrt(3)*sin(2*Pi*n/3)/6. - R. J. Mathar, Oct 08 2011

a(n) = a(n-1) - a(n-2) + a(n-3) - a(n-4) + a(n-5) for n>4. - Wesley Ivan Hurt, Jun 19 2016

a(n+3) = A000358(n)(mod 2), for n>0. - John M. Campbell, Jul 08 2016

Maple

A131719:=n->[0, 1, 1, 1, 1, 0][(n mod 6)+1]: seq(A131719(n), n=0..100); # Wesley Ivan Hurt, Jun 19 2016

Mathematica

PadRight[{}, 200, {0, 1, 1, 1, 1, 0}] (* Wesley Ivan Hurt, Jun 19 2016 *)

Prog

(PARI) a(n)=[0, 1, 1, 1, 1, 0][n%6+1] \\ Charles R Greathouse IV, Jun 02 2011
(Magma) &cat[[0, 1, 1, 1, 1, 0]^^20]; // Wesley Ivan Hurt, Jun 19 2016

Crossrefs

Sequence in context: A102460 A080908 A131720 * A342460 A100656 A285274

Adjacent sequences: A131716 A131717 A131718 * A131720 A131721 A131722

Keyword

nonn,easy,less

Author

Paul Curtz, Sep 15 2007

Status

approved