%I #13 Mar 24 2018 10:10:27

%S 1,0,0,-1,0,0,0,0,0,1,0,0,-1,0,0,1,0,0,0,0,0,-1,0,0,1,0,0,0,0,0,0,0,0,

%T 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,

%U 0,0,0,0,0,0,0,0,0,0,0,0,0,0

%N Inverse of 1665th cyclotomic polynomial.

%C Periodic with period length 1665. - _Ray Chandler_, Apr 07 2017

%H Ray Chandler, <a href="/A015674/b015674.txt">Table of n, a(n) for n = 0..2000</a>

%H <a href="/index/Rec#order_864">Index entries for linear recurrences with constant coefficients</a>, order 864.

%H <a href="/index/Pol#poly_cyclo_inv">Index to sequences related to inverse of cyclotomic polynomials</a>

%p with(numtheory,cyclotomic); c := n->series(1/cyclotomic(n,x),x,80);

%t CoefficientList[Series[1/Cyclotomic[1665,x],{x,0,120}],x] (* _Harvey P. Dale_, Mar 24 2018 *)

%K sign

%O 0,1

%A _Simon Plouffe_