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 A091219 Moebius-analog for the domain GF(2)[X]: a(n)=0 if A091221(n)!=A091222(n) (i.e., if the polynomial is not squarefree), otherwise (-1)^A091222(n). 9
 1, -1, -1, 0, 0, 1, -1, 0, 1, 0, -1, 0, -1, 1, 0, 0, 0, -1, -1, 0, 0, 1, 1, 0, -1, 1, 0, 0, 1, 0, -1, 0, 1, 0, 1, 0, -1, 1, 0, 0, -1, 0, 1, 0, 0, -1, -1, 0, 1, 1, 0, 0, 1, 0, -1, 0, 0, -1, -1, 0, -1, 1, 0, 0, 0, -1, -1, 0, 0, -1, 1, 0, -1, 1, 0, 0, 1, 0, 1, 0, 0, 1, -1, 0, 0, -1, -1, 0, 1, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The absolute values give a characteristic function for squarefree GF(2)[X]-polynomials. LINKS A. Karttunen, Scheme-program for computing this sequence. CROSSREFS a(n) = A008683(A091203(n)) = A008683(A091205(n)). Sequence in context: A145379 A128810 A123272 * A016416 A014024 A014039 Adjacent sequences:  A091216 A091217 A091218 * A091220 A091221 A091222 KEYWORD sign AUTHOR Antti Karttunen, Jan 03 2004 STATUS approved

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Last modified November 17 12:52 EST 2018. Contains 317276 sequences. (Running on oeis4.)