The On-Line Encyclopedia of Integer Sequences (OEIS)

A356464 revision #30

A356464

Number of black keys in each group of black keys on a standard 88-key piano (left to right).

1, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Here the groups of black keys have 1 white key (a half step) between each in the group, and the groups are separated by 2 white keys (a whole step).

LINKS

EXAMPLE

From Jon E. Schoenfield, Aug 12 2022: (Start)

In the diagram below, five octaves (i.e., sets of 12 consecutive keys) have been omitted (as represented by the ellipses):

n | 1 2 3 ... 14 15

----+---------------------------------------------------------

a(n)| 1 2 3 ... 2 3

______________________________ ... _________________________

| |/| | |/||/| | |/||/||/| | | |/||/| | |/||/||/| | |

| |_| | |_||_| | |_||_||_| | | |_||_| | |_||_||_| | |

| | | | | | | | | | | | | | | | | | |

|__|__|__|__|__|__|__|__|__| |__|__|__|__|__|__|__|__|

A B C D E F G A B ... C D E F G A B C

(End)

CROSSREFS

KEYWORD

easy,fini,full,nonn

AUTHOR

STATUS

editing