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A174475 G.f.: exp( Sum_{n>=1} A174476(n)*x^n/n ) where A174476(n) = Sum_{d|n} d^phi(d). 2
1, 1, 2, 5, 10, 138, 155, 17102, 18016, 94540, 154798, 2358249307, 2360592955, 1796879611368, 1804105210014, 3608243138940, 9287964281688, 2862441341177866833, 2862710702184279822, 5486112024184013303138 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
COMMENTS
phi(n) = A000010(n) = Euler totient function of n.
LINKS
PROG
(PARI) {a(n)=polcoeff(exp(sum(m=1, n, x^m/m*sumdiv(m, d, d^eulerphi(d)))+x*O(x^n)), n)}
CROSSREFS
Cf. A174476, A000010 (phi).
Sequence in context: A018751 A277438 A018773 * A133035 A133516 A342489
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Apr 04 2010
STATUS
approved

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Last modified March 3 17:50 EST 2024. Contains 370512 sequences. (Running on oeis4.)