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URL: https://oeis.org/A135599

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A135599
Word obtained from axiom 2 using the morphism 1-> 267, 2-> 13467, 3-> 247, 4-> 23567, 5-> 467, 6-> 12457, 7-> 123456.
1
1, 3, 4, 6, 7, 1, 2, 4, 5, 7, 1, 2, 3, 4, 5, 6, 1, 3, 4, 6, 7, 2, 3, 5, 6, 7, 1, 2, 3, 4, 5, 6, 1, 3, 4, 6, 7, 2, 4, 7, 4, 6, 7, 1, 2, 4, 5, 7, 1, 2, 3, 4, 5, 6, 2, 6, 7, 1, 3, 4, 6, 7, 2, 3, 5, 6, 7, 4, 6, 7, 1, 2, 3, 4, 5, 6, 2, 6, 7, 1, 3, 4, 6, 7, 2, 4, 7, 2, 3, 5, 6, 7, 4, 6, 7, 1, 2, 4, 5, 7, 1, 3, 4, 6, 7
OFFSET
1,2
COMMENTS
Previous name was: Seven-tone substitution on a Fano projective plane graph as used in A120714 (for use in making church tone A,B,C,D,E,F,G music).
Idea inspired by a post in yahoo egroup fractals by "Dahlia Lahla" astro_girl_690(AT)yahoo.ca
In Mathematica you can transfer this to a 12-tone MIDI scale as: to letters
b = a /. 1 -> "a" /. 2 -> "b" /. 3 -> "c" /. 4 -> "d" /. 5 -> "e" /. 6 -> "f" /. 7 -> "g"
back to numbers on a 12-tone scale:
c = b /. "a" -> 1 /. "b" -> 3 /. "c" -> 4 /. "d" -> 6 /. "e" -> 8 /. "f" -> 9 /. "g" -> 11
LINKS
Roger L. Bagula, Feb 26 2008, Table of n, a(n) for n = 1..314
MATHEMATICA
s[1] = {2, 6, 7}; s[2] = {1, 3, 4, 6, 7}; s[3] = {2, 4, 7}; s[4] = {2, 3, 5, 6, 7}; s[5] = {4, 6, 7}; s[6] = {1, 2, 4, 5, 7}; s[7] = {1, 2, 3, 4, 5, 6};
t[a_] := Flatten[s /@ a];
p[0] = s[1]; p[1] = t[p[0]]; p[n_] := t[p[n - 1]]; a = p[3]
CROSSREFS
Cf. A120714.
Sequence in context: A248738 A070737 A225647 * A283740 A167161 A129000
KEYWORD
nonn,easy,less
AUTHOR
Roger L. Bagula, Feb 26 2008
EXTENSIONS
Edited and new name from Joerg Arndt, Sep 26 2018
STATUS
approved