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A054604 a(n) = Sum_{d|5} phi(d)*n^(5/d). 1

%I

%S 0,5,40,255,1040,3145,7800,16835,32800,59085,100040,161095,248880,

%T 371345,537880,759435,1048640,1419925,1889640,2476175,3200080,4084185,

%U 5153720,6436435,7962720,9765725,11881480,14349015,17210480,20511265

%N a(n) = Sum_{d|5} phi(d)*n^(5/d).

%H <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (6,-15,20,-15,6,-1).

%F a(n) = n^5+4n.

%F G.f.: 5*x*(x^4+2*x^3+18*x^2+2*x+1)/(x-1)^6. [_Colin Barker_, Dec 21 2012]

%Y Row n=5 of A185651.

%K nonn,easy

%O 0,2

%A _N. J. A. Sloane_, Apr 16 2000

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Last modified October 14 05:08 EDT 2019. Contains 327995 sequences. (Running on oeis4.)