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A106645
A four-symbol substitution with characteristic polynomial x^4-x-1.
0
2, 4, 1, 2, 4, 1, 3, 1, 2, 4, 1, 2, 4, 1, 3, 1, 3, 4, 3, 1, 3, 1, 2, 4, 1, 2, 4, 1, 3, 1, 2, 4, 1, 2, 4, 1, 3, 1, 3, 4, 3, 1, 3, 1, 3, 4, 3, 2, 4, 3, 4, 3, 1, 3, 1, 3, 4, 3, 1, 3, 1, 2, 4, 1, 2, 4, 1, 3, 1, 2, 4, 1, 2, 4, 1, 3, 1, 3, 4, 3, 1, 3, 1, 2, 4, 1, 2, 4, 1, 3, 1, 2, 4, 1, 2, 4, 1, 3, 1, 3, 4, 3, 1, 3, 1
OFFSET
0,1
COMMENTS
A minimal Pisot like substitution, but in 4 symbols.
FORMULA
1->{2, 4}, 2->{3, 4}, 3->{1}, 4->{3}
MATHEMATICA
s[1] = {2, 4}; s[2] = {3, 4}; s[3] = {1}; s[4] = {3}; t[a_] := Flatten[s /@ a]; p[0] = {1}; p[1] = t[p[0]]; p[n_] := t[p[n - 1]] aa = p[16]
CROSSREFS
Sequence in context: A132954 A069705 A375030 * A115314 A358431 A062039
KEYWORD
nonn,uned
AUTHOR
Roger L. Bagula, May 12 2005
STATUS
approved