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%I #13 Sep 26 2020 15:47:12
%S 1,-1,0,1,-1,0,1,-1,0,1,-1,0,1,-1,0,1,-1,0,1,-1,0,1,-1,1,0,-1,1,0,-1,
%T 2,-1,-1,2,-1,-1,2,-1,-1,2,-1,-1,2,-1,-1,2,-1,0,1,-1,0,1,-1,1,0,-1,1,
%U 0,-1,2,-1,-1,2,-1,-1,2,-1,-1,2,-1,-1,2,-1,-1,2,-1,0,1,-1,0,1,-1
%N Inverse of 2001st cyclotomic polynomial.
%C Periodic with period length 2001. - _Ray Chandler_, Apr 07 2017
%H Ray Chandler, <a href="/A016010/b016010.txt">Table of n, a(n) for n = 0..3000</a>
%H <a href="/index/Rec#order_1232">Index entries for linear recurrences with constant coefficients</a>, order 1232.
%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[2001,x],{x,0,120}],x] (* _Harvey P. Dale_, Sep 26 2020 *)
%K sign
%O 0,30
%A _Simon Plouffe_
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