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A109507
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Let x be a positive number, Lambda(d) = Moebius(d)*[log(x/d)]^2, f(m) = Sum_{d|m} Lambda(d), S(x) = Sum_{m <= x} f(m). Sequence gives nearest integer to S(n).
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1
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0, 1, 3, 7, 11, 15, 20, 25, 31, 35, 43, 46, 55, 60, 66, 71, 81, 85, 95, 100, 106, 112, 124, 127, 137, 143, 151, 156, 169, 171, 185, 192, 199, 205, 214, 217, 232, 238, 246, 250, 266, 268, 284, 290, 296, 302, 319, 323, 336, 340, 349, 354, 372, 376, 386, 390, 399
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OFFSET
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1,3
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REFERENCES
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T. M. Apostol, Introduction to Analytic Number Theory, Springer-Verlag, New York, 1976.
T. Nagell, "Introduction to Number Theory", Chelsea Pub., New York, 1964, Chap. VIII.
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LINKS
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FORMULA
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Selberg proved that S(x) = 2*x*log(x) + o(x*log(x)).
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MATHEMATICA
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lmbd[d_, x_] := MoebiusMu[d]*Log[x/d]^2; f[n_, x_] := Block[{d = Divisors[n]}, Plus @@ lmbd[d, x]]; s[x_] := Sum[f[n, x], {n, x}]; Table[ Floor[ s[n]], {n, 57}]
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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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