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A034680
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Sum of sixth powers of unitary divisors.
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0
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1, 65, 730, 4097, 15626, 47450, 117650, 262145, 531442, 1015690, 1771562, 2990810, 4826810, 7647250, 11406980, 16777217, 24137570, 34543730, 47045882, 64019722, 85884500, 115151530, 148035890, 191365850, 244140626, 313742650
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..26.
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FORMULA
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Dirichlet g.f. zeta(s)*zeta(s-6)/zeta(2s-6). - R. J. Mathar, Apr 12 2011
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MATHEMATICA
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Total[#^6]&/@Table[Select[Divisors[n], GCD[#, n/#]==1&], {n, 30}] (* From Harvey P. Dale, Jul 17 2011 *)
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CROSSREFS
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Cf. A034444, A034448.
Sequence in context: A220229 A200890 A088677 * A017675 A013954 A116277
Adjacent sequences: A034677 A034678 A034679 * A034681 A034682 A034683
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KEYWORD
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nonn,mult
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AUTHOR
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Erich Friedman
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STATUS
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approved
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