A010678 - OEIS

A010678

Period 2: repeat (0,7).

0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0

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OFFSET

0,2

LINKS

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

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

FORMULA

a(n) = (7/2)*[1-(-1)^n] = 7*(n mod 2). - Paolo P. Lava, Oct 20 2006

G.f.: 7x/((1-x)(1+x)). - R. J. Mathar, Nov 21 2011

MATHEMATICA

PadRight[{}, 120, {0, 7}] (* Harvey P. Dale, Oct 01 2013 *)

PROG

(PARI) a(n)=n%2*7 \\ Charles R Greathouse IV, Jul 13 2016

CROSSREFS

Sequence in context: A188928 A036479 A085966 * A010503 A335727 A158857

Adjacent sequences: A010675 A010676 A010677 * A010679 A010680 A010681

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved