%I #19 Jan 07 2018 04:17:54
%S 1,-1,0,1,-1,0,1,-1,0,1,-1,0,1,-1,0,1,-1,1,0,-1,1,0,-1,1,0,-1,1,0,-1,
%T 1,0,0,0,0,1,-1,0,1,-1,0,1,-1,0,1,-1,0,1,-1,1,0,-1,1,0,-1,1,0,-1,1,0,
%U -1,1,0,0,0,0,1,-1,0,1,-1,0,1,-1,0,1,-1,0,1,-1,1,0
%N Inverse of 1581st cyclotomic polynomial.
%C Periodic with period length 1581. - _Ray Chandler_, Apr 07 2017
%H Ray Chandler, <a href="/A015590/b015590.txt">Table of n, a(n) for n = 0..2000</a>
%H <a href="/index/Rec#order_960">Index entries for linear recurrences with constant coefficients</a>, order 960.
%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[1581, x], {x, 0, 100}], x] (* _G. C. Greubel_, Jan 06 2018 *)
%o (PARI) Vec(1/polcyclo(1581) + O(x^100)) \\ _Michel Marcus_, Jan 07 2018
%K sign
%O 0,1
%A _Simon Plouffe_
|