A010721 Period 2: repeat (5,10).

5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Links

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

Crossrefs

Cf. A176325.

Programs

Mathematica

Table[5 + 5 Mod[n, 2], {n, 0, 50}] (* Jinyuan Wang, Feb 26 2020 *)
PadRight[{},80,{5,10}] (* Harvey P. Dale, Mar 18 2022 *)

PARI

a(n)=n%2*5+5 \\ Charles R Greathouse IV, Jul 13 2016

Formula

a(n) = -5/2*(-1)^n + 15/2. - Paolo P. Lava, Oct 27 2006

From R. J. Mathar, Oct 20 2008: (Start)

a(n) = 5*A000034(n).

G.f.: 5(1+2x)/((1-x)(1+x)). (End)