A174475 G.f.: exp( Sum_{n>=1} A174476(n)*x^n/n ) where A174476(n) = Sum_{d|n} d^phi(d).

1, 1, 2, 5, 10, 138, 155, 17102, 18016, 94540, 154798, 2358249307, 2360592955, 1796879611368, 1804105210014, 3608243138940, 9287964281688, 2862441341177866833, 2862710702184279822, 5486112024184013303138

Offset

0,3

Comments

phi(n) = A000010(n) = Euler totient function of n.

Links

Paul D. Hanna, Table of n, a(n) for n=0..256

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

Adjacent sequences: A174472 A174473 A174474 * A174476 A174477 A174478

Keyword

nonn

Author

Paul D. Hanna, Apr 04 2010

Status

approved