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 A010891 Inverse of 5th cyclotomic polynomial. 12
 1, -1, 0, 0, 0, 1, -1, 0, 0, 0, 1, -1, 0, 0, 0, 1, -1, 0, 0, 0, 1, -1, 0, 0, 0, 1, -1, 0, 0, 0, 1, -1, 0, 0, 0, 1, -1, 0, 0, 0, 1, -1, 0, 0, 0, 1, -1, 0, 0, 0, 1, -1, 0, 0, 0, 1, -1, 0, 0, 0, 1, -1, 0, 0, 0, 1, -1, 0, 0, 0, 1, -1, 0, 0, 0, 1, -1, 0, 0, 0, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS D(n):= a(n+3) appears in the formula 2*exp(2*Pi*I/5) = (A(n+ B(n)*phi) + (C(n) + D(n)*phi)*sqrt(2 + phi)*I, with the golden section phi, I = sqrt(-1) and A(n) = A164116(n+5), B(n) = A080891(n) and C(n) = A156174(n+4) for n >= 0. See one of the comments on A164116. - Wolfdieter Lang, Feb 26 2014 Periodic with period length 5. - Ray Chandler, Apr 03 2017 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (-1, -1, -1, -1). FORMULA G.f.: 1/ ( 1+x+x^2+x^3+x^4 ). - R. J. Mathar, Mar 11 2011 a(n) = (1/5)*{-(n mod 5)-[(n+3) mod 5]+2*[(n+4) mod 5]}. - Paolo P. Lava, Mar 10 2011 MAPLE with(numtheory, cyclotomic); c := n->series(1/cyclotomic(n, x), x, 80); MATHEMATICA CoefficientList[Series[1/Cyclotomic[5, x], {x, 0, 100}], x] (* Vincenzo Librandi, Apr 03 2014 *) PROG (PARI) Vec(1/polcyclo(5)+O(x^99)) \\ Charles R Greathouse IV, Mar 24 2014 (MAGMA) &cat[[1, -1, 0, 0, 0]: n in [0..20]]; // Vincenzo Librandi, Apr 03 2014 CROSSREFS Sequence in context: A015439 A016379 A016339 * A014019 A016349 A016392 Adjacent sequences:  A010888 A010889 A010890 * A010892 A010893 A010894 KEYWORD sign,easy AUTHOR STATUS approved

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Last modified April 26 08:05 EDT 2019. Contains 322472 sequences. (Running on oeis4.)