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A054606 a(n) = Sum_{d|7} phi(d)*n^(7/d). 1
0, 7, 140, 2205, 16408, 78155, 279972, 823585, 2097200, 4783023, 10000060, 19487237, 35831880, 62748595, 105413588, 170859465, 268435552, 410338775, 612220140, 893871853, 1280000120, 1801088667, 2494358020, 3404825585 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..23.

Index entries for linear recurrences with constant coefficients, signature (8,-28,56,-70,56,-28,8,-1).

FORMULA

a(n) = n^7+6n.

G.f.: 7*x*(x^6+12*x^5+183*x^4+328*x^3+183*x^2+12*x+1) / (x-1)^8. [Colin Barker, Dec 21 2012]

CROSSREFS

Row n=7 of A185651.

Sequence in context: A288322 A297650 A085708 * A306628 A302912 A191956

Adjacent sequences:  A054603 A054604 A054605 * A054607 A054608 A054609

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Apr 16 2000

STATUS

approved

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Last modified September 21 07:08 EDT 2019. Contains 327253 sequences. (Running on oeis4.)