A137934 - OEIS

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

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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