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A087909 Sum_{d|n} (n/d)^(d-1). +0
2
1, 2, 2, 4, 2, 9, 2, 14, 11, 23, 2, 83, 2, 73, 108, 202, 2, 546, 2, 905, 780, 1037, 2, 5553, 627, 4111, 6644, 12647, 2, 40605, 2, 49682, 59172, 65555, 18028, 382424, 2, 262165, 531612, 869675, 2, 2706581, 2, 3147083, 5180382, 4194329, 2, 27246533, 117651 (list; graph; listen)
OFFSET

1,2

FORMULA

G.f.: Sum_{k>0} x^k/(1-k*x^k).

CROSSREFS

Cf. A055225.

Sequence in context: A113416 A131999 A103178 this_sequence A076078 A103314 A111741

Adjacent sequences: A087906 A087907 A087908 this_sequence A087910 A087911 A087912

KEYWORD

nonn

AUTHOR

Vladeta Jovovic (vladeta(AT)eunet.rs), Oct 15 2003

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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