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A272375
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Negative records in A187202 by index.
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2
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1, 10, 14, 20, 24, 38, 40, 48, 60, 84, 120, 180, 264, 300, 396, 432, 504, 540, 630, 720, 840, 1320, 2184, 2400, 2772, 3024, 3120, 3360, 3780, 3960, 5940, 6840, 7200, 8400, 9240, 10080, 12600, 15120, 21840, 22680, 25200, 27720, 30240, 40320, 52920, 55440, 83160, 128520, 131040, 138600, 166320, 196560, 221760
(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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Often a(n)/2 is a member of A242393.
Search limit: 8300000000.
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LINKS
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MATHEMATICA
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f[n_] := (dvr = Divisors@ n; Differences[dvr, Length@ dvr - 1][[1]]); lst = {}; k = 1; mx = 2; While[k < 1000001, a = f@ k; If[a < mx, mx = a; AppendTo[lst, k]]; k++]
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CROSSREFS
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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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