A016118 - OEIS

%I #13 Apr 01 2018 13:58:18

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

%T -1,1,0,-1,1,0,-1,1,1,-1,0,1,-1,0,1,-1,0,1,-1,0,1,-1,0,1,-1,0,1,0,-1,

%U 1,0,-1,1,0,-1,1,0,-1,1,0,-1,1,0,-1,1,1,-1,0,1,-1,0,1

%N Inverse of 2109th cyclotomic polynomial.

%C Periodic with period length 2109. - _Ray Chandler_, Apr 07 2017

%H Ray Chandler, <a href="/A016118/b016118.txt">Table of n, a(n) for n = 0..3000</a>

%H <a href="/index/Rec#order_1296">Index entries for linear recurrences with constant coefficients</a>, order 1296.

%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[2109,x],{x,0,120}],x] (* _Harvey P. Dale_, Apr 01 2018 *)

%K sign

%O 0,1

%A _Simon Plouffe_