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A087845
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a[n] =a[Min[n-1,Abs[n - a[n-1]]]] + a[a[a[Abs[n - a[n-3]]]]]
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1
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1, 1, 1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 11, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 13, 11, 13, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13, 15, 13, 15, 13, 15, 14, 15, 15, 15, 15, 15, 15, 15, 15
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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COMMENTS
| The fourth recursive of the second term of the skip one Hofstadter Q.
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MATHEMATICA
| Hofstadter3[n_Integer?Positive] := Hofstadter3[n] = Hofstadter3[Min[n-1, Abs[n - Hofstadter3[n-1]]]] + Hofstadter3[Hofstadter3[Hofstadter3[Abs[n - Hofstadter3[n-3]]]]] Hofstadter3[0]=Hofstadter3[1] = Hofstadter3[2]= Hofstadter3[3]= 1 digits=200 ta=Table[Hofstadter3[n], {n, 1, digits}]
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CROSSREFS
| Cf. A005185, A081831.
Sequence in context: A107436 A002024 A123578 * A130146 A113764 A130148
Adjacent sequences: A087842 A087843 A087844 * A087846 A087847 A087848
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KEYWORD
| nonn
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AUTHOR
| Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Oct 07 2003
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