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Search: id:A087814
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| 1, 1, 13, 15, 25, 39, 47, 51, 69, 81, 101, 139, 249, 261, 275, 291, 739, 1243, 2243
(list; graph; listen)
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OFFSET
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0,3
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MATHEMATICA
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Hofstadter123[n_Integer?Positive] := Hofstadter123[n] = Hofstadter123[Abs[n - Hofstadter123[n-1]]] + Hofstadter123[Abs[n - Hofstadter123[n-2]]]+ Hofstadter123[Abs[n - Hofstadter123[n-3]]] Hofstadter123[0] =Hofstadter123[1] = Hofstadter123[2]= Hofstadter123[3]= 1 digits=30000 ta=Table[Hofstadter123[n], {n, 1, digits}]; b=Table[If[ta[[n]]-ta[[n-1]]==0, ta[[n]], 0], {n, 2, digits}]; c=Delete[Union[b], 1]
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CROSSREFS
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Cf. A087655.
Sequence in context: A067912 A140646 A109656 this_sequence A113801 A108257 A106134
Adjacent sequences: A087811 A087812 A087813 this_sequence A087815 A087816 A087817
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KEYWORD
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nonn
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Oct 05 2003
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