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editing
approved
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Revision History for A343520
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a(n) = Sum_{1 <= x_1 <= x_2 <= x_3 <= x_4 <= x_5 <= x_6 <= n} gcd(x_1, x_2, x_3 , x_4, x_5, x_6, n).
(history; published version)
(history; published version)
LINKS
Vaclav Kotesovec, <a href="/A343520/b343520.txt">Table of n, a(n) for n = 1..10000</a>
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editing
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approved
FORMULA
Sum_{k=1..n} a(k) ~ Pi^6 * n^7 / (4762800*zeta(7)). - Vaclav Kotesovec, May 23 2021
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reviewed
approved
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proposed
reviewed
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proposed
MATHEMATICA
a[n_] := DivisorSum[n, EulerPhi[n/#] * Binomial[# + 5, 6] &]; Array[a, 50] (* Amiram Eldar, Apr 18 2021 *)
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proposed
editing
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proposed
MATHEMATICA
a[n_] := DivisorSum[n, EulerPhi[n/#]*Binomial[# + 5, 6] &]; Array[a, 50] (* Amiram Eldar, Apr 18 2021 *)
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proposed
editing