A015647 - OEIS

%I #13 May 28 2018 10:43:12

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

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

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

%N Inverse of 1638th cyclotomic polynomial.

%C Periodic with period length 1638. - _Ray Chandler_, Apr 07 2017

%H Ray Chandler, <a href="/A015647/b015647.txt">Table of n, a(n) for n = 0..2000</a>

%H <a href="/index/Rec#order_432">Index entries for linear recurrences with constant coefficients</a>, order 432.

%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[1638,x],{x,0,120}],x] (* _Harvey P. Dale_, May 28 2018 *)

%K sign

%O 0,1

%A _Simon Plouffe_