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A174724
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Sum_{k=1..n} Floor((k + 3*sqrt(k))/k).
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0
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4, 7, 9, 11, 13, 15, 17, 19, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77
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OFFSET
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1,1
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LINKS
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FORMULA
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(k+3*sqrt(k)) / k > = 1, (k+3*sqrt(k)) / k < 2 <=> k >=10, a(n) = 4 if n=1, a(n) = 2n + 3 if 2 <= n <= 9, a(n) = n + 12 if n>=10.
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MAPLE
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for n from 1 to 100 do: s:=0: for k from 1 to n do: s:=s+floor((k+3*sqrt(k))/k) : od:print(s):od:
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MATHEMATICA
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Accumulate[Table[Floor[(k+3*Sqrt[k])/k], {k, 70}]] (* Harvey P. Dale, Apr 27 2022 *)
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PROG
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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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