A015290 - OEIS

%I #16 Dec 12 2020 19:01:06

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

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

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

%N Inverse of 1281st cyclotomic polynomial.

%C Periodic with period length 1281. - _Ray Chandler_, Apr 07 2017

%H Ray Chandler, <a href="/A015290/b015290.txt">Table of n, a(n) for n = 0..2000</a>

%H <a href="/index/Rec#order_720">Index entries for linear recurrences with constant coefficients</a>, order 720.

%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[1281,x],{x,0,120}],x,120] (* _Harvey P. Dale_, Dec 12 2020 *)

%K sign

%O 0,1

%A _Simon Plouffe_