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A347397
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a(n) = Sum_{k=1..n} k^k * floor(n/k^k).
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4
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1, 2, 3, 8, 9, 10, 11, 16, 17, 18, 19, 24, 25, 26, 27, 32, 33, 34, 35, 40, 41, 42, 43, 48, 49, 50, 78, 83, 84, 85, 86, 91, 92, 93, 94, 99, 100, 101, 102, 107, 108, 109, 110, 115, 116, 117, 118, 123, 124, 125, 126, 131, 132, 160, 161, 166, 167, 168, 169, 174, 175, 176, 177, 182, 183, 184
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OFFSET
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1,2
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COMMENTS
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What is the limit_{n->infinity} a(n) / (n*log(n)/LambertW(log(n))) ?. - Vaclav Kotesovec, Aug 30 2021
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LINKS
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FORMULA
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G.f.: (1/(1 - x)) * Sum_{k>=1} k^k * x^(k^k)/(1 - x^(k^k)).
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MATHEMATICA
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Table[Sum[k^k*Floor[n/k^k], {k, 1, n}], {n, 1, 100}] (* Vaclav Kotesovec, Aug 30 2021 *)
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PROG
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(PARI) a(n) = sum(k=1, n, k^k*(n\k^k));
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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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