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A034681 Sum of seventh powers of unitary divisors. 1
1, 129, 2188, 16385, 78126, 282252, 823544, 2097153, 4782970, 10078254, 19487172, 35850380, 62748518, 106237176, 170939688, 268435457, 410338674, 617003130, 893871740, 1280094510, 1801914272, 2513845188, 3404825448 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..23.

FORMULA

Dirichlet g.f. zeta(s)*zeta(s-7)/zeta(2s-7). - R. J. Mathar, Apr 12 2011

CROSSREFS

Cf. A034444, A034448.

Sequence in context: A230187 A240417 A088719 * A017677 A013955 A294302

Adjacent sequences:  A034678 A034679 A034680 * A034682 A034683 A034684

KEYWORD

nonn,mult

AUTHOR

Erich Friedman

STATUS

approved

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Last modified October 16 23:12 EDT 2018. Contains 316275 sequences. (Running on oeis4.)