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A084846
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mu(n!+1), where mu is the Moebius function (A008683).
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4
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-1, -1, -1, -1, 0, 0, 1, 0, 1, -1, 1, -1, 0, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, 0, 1, 1, 1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -1, -1, 1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, -1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, -1, -1, -1, -1, -1, -1, 1, -1, 1, -1, 1, 1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, 1, 1, 1, 1, -1, 1, 1, 1, 1, 1, -1, 1
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OFFSET
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0,1
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LINKS
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FORMULA
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EXAMPLE
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a(6)=1 because 6!+1 = 721 = 7 * 103, the product of two different primes and thus mu(6!+1) = (-1)^2 = 1.
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PROG
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(Magma) [MoebiusMu(Factorial(n)+1) : n in [1..45]];
(PARI) for(n=0, 45, print1(moebius(n!+1), ", "))
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CROSSREFS
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KEYWORD
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hard,sign
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AUTHOR
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EXTENSIONS
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a(112) corrected, a(113)-a(114) added by Max Alekseyev, May 28 2015
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STATUS
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approved
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