16/15

Interval information

Ratio	16/15
Factorization	24 × 3-1 × 5-1
Monzo	[4 -1 -1⟩
Size in cents	111.7313¢
Names	just diatonic semitone, classic(al) diatonic semitone, ptolemaic diatonic semitone
Color name	g2, gu 2nd
FJS name	[math]\displaystyle{ \text{m2}_{5} }[/math]
Special properties	square superparticular, reduced, reduced subharmonic
Tenney height (log2 nd)	7.90689
Weil height (log2 max(n, d))	8
Wilson height (sopfr(nd))	16
Harmonic entropy (Shannon, [math]\displaystyle{ \sqrt{nd} }[/math])	~4.27487 bits
Comma size	large
S-expressions	S4, S6 × S7 × S8
[sound info]
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Semitone

The 5-limit superparticular interval 16/15 is the just diatonic semitone, classic(al) diatonic semitone or ptolemaic diatonic semitone – the difference between the major third 5/4 and the fourth 4/3, and between 3/2 and 8/5.

Temperaments

When this ratio is taken as a comma to be tempered out, it produces father temperament, and lends itself the name father comma. In this exotemperament, 4/3 and 5/4 are equated, and major thirds and fifths become octave complements of each other. It is a Mersenne comma.

See also

• 15/8 – its octave complement
• 45/32 – its fifth complement
• 5/4 – its fourth complement
• 256/243 – the Pythagorean (3-limit) diatonic semitone
• Gallery of just intervals
• List of superparticular intervals
• 16/15 equal-step tuning – equal multiplication of this interval