OFFSET
1,2
COMMENTS
Major chords: If we were to number the musical notes in increasing order of frequency starting with the key of C, we would get C as 1, C# as 2, D as 3 and so on until the next octave. My sequence comprises the keys that would make major chord sounds; for example, a C major chord would be 1,5,8, and a C# major chord would be 2,6,9, and so on.
LINKS
Index entries for linear recurrences with constant coefficients, signature (1,0,1,-1).
FORMULA
G.f.: x*(1+4*x+3*x^2-7*x^3)/((-1+x)^2 *(1+x+x^2)).
MATHEMATICA
Flatten[Table[{n, n + 4, n + 7}, {n, 33}]] (* T. D. Noe, Sep 03 2013 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Yash Deshpande, Jul 11 2013
STATUS
approved