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A308481
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a(n) = Sum_{k=1..n, gcd(n,k) = 1} k^n.
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3
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1, 1, 9, 82, 1300, 15626, 376761, 6161988, 176787117, 3769318700, 142364319625, 3152513804548, 154718778284148, 4340009120036086, 210971169748692000, 7281661100510001416, 435659030617933827136, 14181101408561469791694, 1052864393300587929716721, 41673894815421072916530408
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OFFSET
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1,3
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LINKS
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MATHEMATICA
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a[n_] := Sum[If[GCD[n, k] == 1, k^n, 0], {k, 1, n}]; Table[a[n], {n, 1, 20}]
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PROG
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(PARI) a(n) = sum(k=1, n, (gcd(n, k)==1)*k^n) \\ Felix Fröhlich, May 30 2019
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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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