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3, 6, 4, 9, 6, 8, 6, 12, 5, 12, 6, 12, 6, 12, 8, 15, 6, 10, 6, 18, 8, 12, 6, 16, 9, 12, 6, 18, 6, 16, 6, 18, 8, 12, 12, 15, 6, 12, 8, 24, 6, 16, 6, 18, 10, 12, 6, 20, 9, 18, 8, 18, 6, 12, 12, 24, 8, 12, 6, 24, 6, 12, 10, 21, 12, 16, 6, 18, 8, 24, 6, 20, 6, 12, 12
(list;
graph;
refs;
listen;
history;
text;
internal format)
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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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Sum_{k=1..n} a(k) ~ (21*n*(log(n) + 2*gamma - 1) + n*6*log(3)) / 9, where gamma is the Euler-Mascheroni constant A001620.
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MATHEMATICA
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Table[DivisorSigma[0, 9*n], {n, 1, 150}]
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PROG
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CROSSREFS
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Cf. A000005, A099777, A372713, A372784, A372785, A372786, A372787, A372788, A372790, A372791, A372792.
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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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