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A341036
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a(n) = Sum_{k=1..n} gcd(k,n)^(k-2).
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2
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1, 2, 5, 19, 129, 1306, 16813, 262181, 4783059, 100000214, 2357947701, 61917372083, 1792160394049, 56693912393474, 1946195068811453, 72057594039243049, 2862423051509815809, 121439531096661117354, 5480386857784802185957
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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a[n_] := Sum[GCD[k, n]^(k - 2), {k, 1, n}]; Array[a, 20] (* Amiram Eldar, Mar 13 2021 *)
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PROG
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(PARI) a(n) = sum(k=1, n, gcd(k, n)^(k-2));
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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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