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Search: id:A102005
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| A102005 |
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Fixed point of the morphism 1 -> 12, 2 -> 111. |
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+0
1
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| 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 1
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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A binary non-Pisot sequence.
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REFERENCES
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A. Hof, O. Knill and B. Simon, Singular continuous spectrum for palindromic Schroedinger operators, Commun. Math. Phys. 174 (1995), 149-159.
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MAPLE
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f:=proc(n) if n=1 then 1, 2 elif n=2 then 1, 1, 1 else fi end: g[1]:=[1]: for n from 2 to 7 do g[n]:=map(f, g[n-1]) od: g[7]; (Deutsch)
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MATHEMATICA
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Nest[ Function[l, {Flatten[(l /. {1 -> {1, 2}, 2 -> {1, 1, 1}})]}], {1}, 6] (from Robert G. Wilson v Feb 26 2005)
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CROSSREFS
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Sequence in context: A115721 A138330 A128591 this_sequence A051700 A025892 A025883
Adjacent sequences: A102002 A102003 A102004 this_sequence A102006 A102007 A102008
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KEYWORD
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nonn,easy
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AUTHOR
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njas, Feb 03 2005
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Feb 23 2005
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