A014672 - OEIS

%I #18 Jun 01 2026 07:30:57

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

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

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

%N Inverse of 663rd cyclotomic polynomial.

%C Periodic with period length 663. - _Ray Chandler_, Apr 06 2017

%H Ray Chandler, <a href="/A014672/b014672.txt">Table of n, a(n) for n = 0..1000</a>

%H <a href="/index/Per#periodic">Index entries for periodic sequences</a>.

%H <a href="/index/Rec#order_384">Index entries for linear recurrences with constant coefficients</a>, order 384.

%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[663,x],{x,0,90}],x,90] (* _Harvey P. Dale_, Apr 26 2026 *)

%o (PARI) Vec(1/polcyclo(663)+O(x^99)) \\ _Charles R Greathouse IV_, Jun 01 2026

%K sign,easy,changed

%O 0,1

%A _Simon Plouffe_