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A060185
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Generalized sum of divisors function: second diagonal of A060184.
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1
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1, 0, 1, 2, 1, 1, 1, 6, -1, 5, -3, 10, 0, 9, -7, 16, -9, 17, -6, 22, -13, 20, -15, 28, -14, 35, -23, 36, -25, 36, -24, 42, -26, 53, -37, 50, -34, 58, -45, 60, -49, 75, -37, 66, -55, 77, -59, 74, -60, 101, -71, 88, -64, 106, -74, 92, -83, 124, -89, 98, -79, 130, -90, 120, -105, 155, -104, 120, -113, 163, -121, 126, -111
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OFFSET
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3,4
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LINKS
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MATHEMATICA
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max = 80; s = Sum[q^(m1 + m2)/((1 + q^m1)*(1 + q^m2)), {m1, 1, max-1}, {m2, m1+1, max}]; CoefficientList[Series[s, {q, 0, max}] , q][[4 ;; max]] (* Jean-François Alcover, Jan 21 2014 *)
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CROSSREFS
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KEYWORD
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easy,sign
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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