A176895 - OEIS

A176895

Period 4: repeat [1, 4, 2, 4].

1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1, 4, 2, 4, 1

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..104.

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

FORMULA

a(n) = 4/gcd(n,4). - Michael Somos, Jan 06 2011

a(n) = 4-(1+(-1)^n)*(5+I^n)/4. - Bruno Berselli, Mar 22 2011

G.f.: ( 1+4*x+2*x^2+4*x^3 ) / ( (1-x)*(1+x)*(x^2+1) ). - R. J. Mathar, Mar 21 2011

From Wesley Ivan Hurt, Jul 11 2016: (Start)

a(n) = a(n-4) for n>3.