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CoefficientList[Series[1/Cyclotomic[671, x], {x, 0, 671}], x] (* Harvey P. Dale, Mar 31 2019 *)
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Periodic with period length 671. - Ray Chandler, Apr 06 2017
<a href="/index/Rec#order_600">Index entries for linear recurrences with constant coefficients</a>, order 600.
<a href="/index/Pol#poly_cyclo_inv">Index to sequences related to inverse of cyclotomic polynomials</a>
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Ray Chandler, <a href="/A014680/b014680.txt">Table of n, a(n) for n = 0..1000</a>
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Inverse of 671-th 671st cyclotomic polynomial.
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Simon Plouffe (simon.plouffe(AT)gmail.com)