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A054604
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a(n) = Sum_{d|5} phi(d)*n^(5/d).
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2
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0, 5, 40, 255, 1040, 3145, 7800, 16835, 32800, 59085, 100040, 161095, 248880, 371345, 537880, 759435, 1048640, 1419925, 1889640, 2476175, 3200080, 4084185, 5153720, 6436435, 7962720, 9765725, 11881480, 14349015, 17210480, 20511265
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = n^5 + 4n.
G.f.: 5*x*(x^4+2*x^3+18*x^2+2*x+1)/(x-1)^6. [Colin Barker, Dec 21 2012]
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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