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A098035
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Sum{k|n} mu(k+1), where mu() is Moebius function.
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2
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-1, -2, -1, -3, 0, -3, -1, -3, 0, -2, -1, -5, 0, -1, 0, -4, -1, -3, -1, -2, 0, -3, -1, -5, 1, -1, 0, -3, -2, -4, -1, -3, 0, -1, 0, -6, 0, -1, 0, -3, -2, -2, -1, -4, 2, -3, -1, -6, -1, 0, -1, -3, -1, -2, 0, -2, 0, -4, -1, -6, 0, -2, 1, -2, 0, -4, -1, -1, -2, -2, -1, -7, 0, -1, 1, -1, -2, -3, -1, -4, 1, -4, -1, -4, 1, -1, -2, -5, -1, -2, 0, -3, 0, -1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| 12's divisors are 1, 2, 3, 4, 6 and 12. So a(12) = mu(2)+mu(3)+mu(4)+mu(5)+mu(7)+mu(13) = -1-1+0-1-1-1 = -5.
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MATHEMATICA
| f[n_] := Plus @@ MoebiusMu[Divisors[n] + 1]; Table[ f[n], {n, 105}] (from Robert G. Wilson v Nov 01 2004)
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CROSSREFS
| Cf. A008683, A098018.
Sequence in context: A194665 A004563 A146094 * A079055 A122170 A066029
Adjacent sequences: A098032 A098033 A098034 * A098036 A098037 A098038
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KEYWORD
| sign
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AUTHOR
| Leroy Quet Oct 24 2004
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EXTENSIONS
| More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Nov 01 2004
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