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A218445
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a(n) = Sum_{k>=0} floor(n/(5*k + 2)).
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3
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0, 0, 1, 1, 2, 2, 3, 4, 5, 5, 6, 6, 8, 8, 10, 10, 11, 12, 13, 13, 14, 15, 17, 17, 19, 19, 20, 21, 23, 23, 24, 24, 26, 26, 28, 29, 31, 32, 33, 33, 34, 34, 37, 37, 39, 39, 40, 41, 43, 44, 45, 46, 48, 48, 50, 50, 52, 53, 54, 54, 56, 56, 58, 59, 61, 61, 63, 64, 66, 66, 68, 68, 71, 71, 73, 73, 74, 76, 77, 77, 78
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OFFSET
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0,5
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COMMENTS
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LINKS
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MATHEMATICA
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Table[Sum[Floor[n/(5k+2)], {k, 0, n}], {n, 0, 80}] (* Harvey P. Dale, Dec 08 2022 *)
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PROG
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(PARI) a(n)=sum(k=0, n\5, (n\(5*k+2)))
(Maxima) A218445[n]:=sum(floor(n/(5*k+2)), k, 0, n)$
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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