A010712 Period 2: repeat (4,7).

4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4, 7, 4

Offset

0,1

Comments

a(n) = A047892(n+1) mod 9. - Reinhard Zumkeller, Sep 23 2007

Continued fraction expansion of A176217. - R. J. Mathar, Mar 08 2012

Links

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

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

Formula

a(n) = -(3/2)*(-1)^n + 11/2. - Paolo P. Lava, Oct 20 2006

a(n) = 3 + 4^(n mod 2). - Reinhard Zumkeller, Sep 23 2007

G.f.: (4+7x)/((1-x)(1+x)). - R. J. Mathar, Nov 21 2011

a(n) = 4 + 2^(1-(-1)^n) - 1. - Vincenzo Librandi, Feb 27 2020

Mathematica

PadRight[{}, 120, {4, 7}] (* Harvey P. Dale, Nov 15 2012 *)

Prog

(PARI) a(n)=4+n%2*3 \\ Charles R Greathouse IV, Dec 21 2011
(Haskell)
a010712 = (+ 3) . (4 ^) . flip mod 2
a010712_list = cycle [4, 7]  -- Reinhard Zumkeller, Mar 19 2014
(Magma) &cat [[4, 7]^^50]; // Vincenzo Librandi, Feb 27 2020

Crossrefs

Sequence in context: A195362 A106739 A112677 * A259499 A254398 A081884

Adjacent sequences: A010709 A010710 A010711 * A010713 A010714 A010715

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved