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

Offset

0,2

Comments

Decimal expansion of 7/99. - Elmo R. Oliveira, Sep 27 2025

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

E.g.f.: 7*sinh(x). - Elmo R. Oliveira, Sep 27 2025

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

Cf. A000035.

Sequence in context: A188928 A036479 A085966 * A010503 A392558 A335727

Adjacent sequences: A010675 A010676 A010677 * A010679 A010680 A010681

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved