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A106797
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Fixed point of the morphism 1 -> 1,1,1,1,2,2,3; 2 -> 4,1; 3 -> 2,1,1,1; 4 -> 1,2,1 starting with a(0) = 1.
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4
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1, 1, 1, 1, 2, 2, 3, 1, 1, 1, 1, 2, 2, 3, 1, 1, 1, 1, 2, 2, 3, 1, 1, 1, 1, 2, 2, 3, 4, 1, 4, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 2, 3, 1, 1, 1, 1, 2, 2, 3, 1, 1, 1, 1, 2, 2, 3, 1, 1, 1, 1, 2, 2, 3, 4, 1, 4, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 2, 3, 1, 1, 1, 1, 2, 2, 3, 1, 1, 1, 1, 2, 2, 3, 1, 1, 1, 1, 2, 2, 3, 4, 1, 4, 1, 2
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OFFSET
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0,5
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COMMENTS
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4-symbol substitution of the Pisot characteristic polynomial: x^4 - 4*x^3 - 6*x^2 - x - 1.
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LINKS
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EXAMPLE
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The first few steps of the substitution are:
Start: 1
Maps:
1 --> 1 1 1 1 2 2 3
2 --> 4 1
3 --> 2 1 1 1
4 --> 1 2 1
-------------
0: (#=1)
1
1: (#=7)
1111223
2: (#=36)
111122311112231111223111122341412111
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MATHEMATICA
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s[1]= {1, 1, 1, 1, 2, 2, 3}; s[2]= {4, 1}; s[3]= {2, 1, 1, 1}; s[4]= {1, 2, 1};
t[a_]:= Flatten[s /@ a]; p[0]= {1}; p[1]= t[p[0]]; p[n_]:= t[p[n-1]]; p[3]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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