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A356464 revision #31

A356464 Number of black keys in each group of black keys on a standard 88-key piano (left to right). 0
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
Table of n, a(n) for n=1..15.
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
Cf. A059620, A060107, A060106, A081031, A081032.
Cf. A329207.
Sequence in context: A339092 A165587 A368405 * A010693 A158478 A139713
Adjacent sequences: A356461 A356462 A356463 * A356465 A356466 A356467
KEYWORD
easy,fini,full,nonn
AUTHOR
Peter Woodward, Aug 08 2022
STATUS
proposed

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Last modified August 30 11:14 EDT 2024. Contains 375543 sequences. (Running on oeis4.)