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A098699
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Anti-derivative of n: or the first occurrence of n in A003415, or zero if impossible.
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6
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1, 2, 0, 0, 4, 6, 9, 10, 15, 14, 21, 0, 8, 22, 33, 26, 12, 0, 65, 34, 51, 18, 57, 0, 20, 46, 69, 27, 115, 0, 161, 30, 16, 62, 93, 0, 155, 0, 217, 45, 111, 42, 185, 82, 24, 50, 129, 0, 44, 94, 141, 63, 235, 0, 329, 75, 52, 0, 265, 70, 36, 66, 177, 122, 183, 0, 305, 0, 40, 134
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| a(n)=n for 4,27,3125,823543, (A051674).
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LINKS
| T. D. Noe, Table of n, a(n) for n=0..5000
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MATHEMATICA
| a[1] = 0; a[n_] := Block[{f = Transpose[ FactorInteger[ n]]}, If[ PrimeQ[n], 1, Plus @@ (n*f[[2]]/f[[1]])]]; b = Table[0, {70}]; b[[1]] = 1; Do[c = a[n]; If[c < 70 && b[[c + 1]] == 0, b[[c + 1]] = n], {n, 10^3}]; b
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CROSSREFS
| Cf. A003415, zeros in A098700.
Sequence in context: A115179 A131742 A056676 * A021837 A155719 A153772
Adjacent sequences: A098696 A098697 A098698 * A098700 A098701 A098702
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KEYWORD
| nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 21 2004
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