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Search: id:A059775
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| A059775 |
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From solution to a counting problem. |
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+0
1
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| 0, 24, 120, 360, 824, 1664, 2992, 5000, 7848, 11808, 17024, 23888, 32576, 43432, 56816, 73136, 92616, 115872, 143104, 174928, 211808, 254312, 302680, 357832, 420136, 490232, 568664, 656360, 753496, 861376, 980232, 1111016, 1254504
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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D. Constales, Solution to Problem 10540, Amer. Math. Monthly, 108 (Feb. 200), 172-173.
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MAPLE
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[seq(n*(n-1)*(n^2-n-1) + 4*add(floor(n/k^2)*phi(k), k=2..floor(sqrt(n))) - 2*add(floor(n/k)^2*phi(k), k=2..n), n=2..30)];
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CROSSREFS
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Sequence in context: A137799 A114200 A069074 this_sequence A052762 A099317 A052760
Adjacent sequences: A059772 A059773 A059774 this_sequence A059776 A059777 A059778
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Feb 21 2001
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