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A106644
A minimal four-symbol substitution with characteristic polynomial x^4-x-1.
0
4, 2, 3, 3, 1, 3, 1, 1, 4, 3, 1, 1, 4, 1, 4, 4, 2, 3, 1, 1, 4, 1, 4, 4, 2, 1, 4, 4, 2, 4, 2, 3, 3, 1, 1, 4, 1, 4, 4, 2, 1, 4, 4, 2, 4, 2, 3, 1, 4, 4, 2, 4, 2, 3, 4, 2, 3, 3, 1, 3, 1, 1, 4, 1, 4, 4, 2, 1, 4, 4, 2, 4, 2, 3, 1, 4, 4, 2, 4, 2, 3, 4, 2, 3, 3, 1, 1, 4, 4, 2, 4, 2, 3, 4, 2, 3, 3, 1, 4, 2, 3, 3, 1, 3, 1
OFFSET
0,1
COMMENTS
A minimal Pisot like substitution matrix isomer, but in 4 symbols.
FORMULA
1->{3), 2->{4}, 3->{2, 4}, 4->{1}
MATHEMATICA
s[1] = {3}; s[2] = {4}; s[3] = {4, 2}; s[4] = {1}; t[a_] := Flatten[s /@ a]; p[0] = {1}; p[1] = t[p[0]]; p[n_] := t[p[n - 1]] aa = p[26]
CROSSREFS
Sequence in context: A019614 A051528 A073244 * A345996 A190874 A307367
KEYWORD
nonn,uned
AUTHOR
Roger L. Bagula, May 12 2005
STATUS
approved