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Search: id:A133270
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| A133270 |
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Algorithmic substitution of minor 7th chords: 12 chords of 4 notes each as being graph like. |
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+0
4
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| 1, 4, 8, 11, 4, 7, 11, 2, 8, 11, 3, 6, 11, 4, 6, 9, 4, 7, 11, 2, 7, 10, 2, 5, 11, 4, 6, 9, 2, 5, 9, 12, 8, 11, 3, 6, 11, 4, 6, 9, 3, 6, 10, 1, 6, 9, 1, 4, 11, 4, 6, 9, 4, 7, 11, 2, 6, 9, 1, 4, 9, 12, 4, 7, 4, 7, 11, 2, 7, 10, 2, 5, 11, 4, 6, 9, 2, 5, 9, 12, 7, 10, 2, 5, 10, 3, 5, 8, 2, 5, 9, 12, 5, 8
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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I am using chords taken from the first pages of Mel Bey's manuscript book.
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REFERENCES
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Mel Bey, http://www.smu.edu/totw/chords.htm
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FORMULA
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1->{1, 4, 8, 11}, 2-> {2, 5, 9, 12}, 3-> {3, 6, 10, 1}, 4-> {4, 7, 11, 2}, 5-> {5, 8, 12, 3}, 6-> {6, 9, 1, 4}, 7-> {7, 10, 2, 5}, 8-> {8, 11, 3, 6}, 9-> {9, 12, 4, 7}, 10-> {10, 3, 5, 8}, 11-> {11, 4, 6, 9}, 12-> {12, 5, 7, 10}}
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MATHEMATICA
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Clear[s, p] s[i_] = {i, If[i + 3 > 12, i - 7, i + 3], If[i + 7 > 12, i - 5, i + 7], If[i + 10 > 12, i - 2, i + 10]}; t[a_] := Flatten[s /@ a]; p[0] = {1}; p[1] = t[p[0]]; p[n_] := t[p[n - 1]]; p[4]
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CROSSREFS
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Sequence in context: A136861 A109445 A131803 this_sequence A131517 A076689 A161867
Adjacent sequences: A133267 A133268 A133269 this_sequence A133271 A133272 A133273
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KEYWORD
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nonn,uned
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Oct 16 2007
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