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A106796 4-symbol substitution 1d Pisot characteristic polynomial: x^4-2*x^2-x-1. 0

%I

%S 1,1,2,1,1,2,3,1,1,2,1,1,2,3,1,4,1,1,2,1,1,2,3,1,1,2,1,1,2,3,1,4,1,1,

%T 2,1,1,1,2,1,1,2,3,1,1,2,1,1,2,3,1,4,1,1,2,1,1,2,3,1,1,2,1,1,2,3,1,4,

%U 1,1,2,1,1,1,2,1,1,2,3,1,1,2,1,1,2,1,1,2,3,1,1,2,1,1,2,3,1,4,1,1,2,1,1,2,3

%N 4-symbol substitution 1d Pisot characteristic polynomial: x^4-2*x^2-x-1.

%D Pure Discrete Spectrum for One Dimensional Substitution Systems of Pisot Type, V. F. Sirvent and B. Solomyak, page 14, example 3

%F 1->{1, 1, 2}, 2->{3}, 3->{1, 4}, 4->{1}

%t s[1] = {1, 1, 2}; s[2] = {3}; s[3] = {1, 4}; s[4] = {1}; t[a_] := Flatten[s /@ a]; p[0] = {1}; p[1] = t[p[0]]; p[n_] := t[p[n - 1]] aa = p[6]

%Y Cf. A106749.

%K nonn,uned

%O 0,3

%A _Roger L. Bagula_, May 17 2005

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Last modified August 18 22:08 EDT 2019. Contains 326109 sequences. (Running on oeis4.)