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A240074
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Index of the first superabundant number k having abundance >= n.
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0
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1, 4, 11, 23, 43, 82, 149, 278, 471, 853, 1378, 2594, 4474, 7999, 15747, 27458, 48615, 84320, 166806, 297146, 544525, 973799
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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Sequence A004394 has a link to a file containing the first 10^6 superabundant numbers. Sequence A023199 lists the first 9 numbers.
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LINKS
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FORMULA
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a(n) = least k such that A004394(k) > n*k.
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CROSSREFS
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KEYWORD
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nonn,more,hard
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AUTHOR
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STATUS
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approved
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