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A105863
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a(n) = n * Sum_{d|n} (binomial(n,d) / gcd(n,d)).
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2
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1, 6, 12, 44, 30, 252, 56, 856, 846, 3080, 132, 20616, 182, 49532, 52110, 237232, 306, 1227096, 380, 4106320, 2470272, 15525092, 552, 86092176, 1328900, 270424752, 126624006, 1157002616, 870, 5577100260, 992, 19572325728, 6386892930
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OFFSET
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1,2
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LINKS
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FORMULA
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a(n) = n * A056045(n) = n * Sum_{d|n} (binomial(n, d) / gcd(n, d)).
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MATHEMATICA
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f[n_] := Block[{d = Divisors[n]}, n*Plus @@ (Binomial[n, d])]; Table[ f[n], {n, 34}]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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