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A130088
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a(n) = numerator of Product_{k=1..n} k^mu(n+1-k), where mu(k) = A008683(k).
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3
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1, 2, 3, 2, 5, 3, 7, 1, 3, 25, 22, 21, 104, 21, 20, 11, 408, 585, 380, 55, 6272, 2431, 14904, 95, 176000, 25857, 1008, 149891, 356352, 10625, 510136, 35397, 7904, 224315, 35280, 776457, 118513664, 8265, 135200, 5425, 143972204544, 108150889
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OFFSET
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1,2
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LINKS
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EXAMPLE
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a(5) = numerator(1^(-1)*2^(0)*3^(-1)*4^(-1)*5^(1)) = numerator(5/12) = 5.
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MAPLE
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with(numtheory): a:=n->numer(mul(k^mobius(n+1-k), k=1..n)): seq(a(n), n=1..50); # Emeric Deutsch, May 09 2007
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PROG
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(PARI) a(n) = numerator(prod(k=1, n, k^moebius(n+1-k))); \\ Michel Marcus, Feb 12 2019
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CROSSREFS
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KEYWORD
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frac,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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