A137934 Period 6: 2,2,2,2,2,0.

2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 0, 2, 2, 2, 2, 2, 0

Offset

1,1

Links

Table of n, a(n) for n=1..114.

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

Formula

a(n) = lcm(gcd(n mod 2, n mod 3), 2).

From R. J. Mathar, Mar 06 2008: (Start)

O.g.f.: -2*x*(1+x+x^2+x^3+x^4)/((x-1)(x+1)(x^2+x+1)(x^2-x+1)).

a(n) = 2*A097325(n). (End)

Prog

(PARI) a(n)=if(n%6, 2, 0) \\ Charles R Greathouse IV, Jul 13 2016

Crossrefs

Sequence in context: A173069 A363934 A059963 * A133738 A240713 A111409

Adjacent sequences: A137931 A137932 A137933 * A137935 A137936 A137937

Keyword

nonn,easy

Author

William A. Tedeschi, Feb 29 2008

Status

approved