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0, 0, 0, 0, 0, 2, 6, 10, 49, 103, 122, 167
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,6
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LINKS
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MATHEMATICA
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a007691[m_] := Block[{f = 0, i = 1}, While[f < m, If[Divisible[DivisorSigma[1, i], i], ++f]; ++i; ]; Return[i - 1]]
a153800[n_] := Block[{i = 2, j, f = 0}, While[f < n, j = a007691[i]; If[PerfectNumberQ[j], ++f; ]; ++i]; Return[i - 1]]
a[n_] := a153800[n] - MersennePrimeExponent[n]
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CROSSREFS
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KEYWORD
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more,nonn
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AUTHOR
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STATUS
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approved
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