Blackjackisma

Interval information

Ratio	854296875/843308032
Factorization	2-10 × 37 × 58 × 7-7
Monzo	[-10 7 8 -7⟩
Size in cents	22.413372¢
Name	blackjackisma
Color name	Lr7y8-6, Lasepru-aquadbiyo comma
FJS name	[math]\text{7d}{-6}^{5,5,5,5,5,5,5,5}_{7,7,7,7,7,7,7}[/math]
Special properties	reduced
Tenney height (log2 nd)	59.3216
Weil height (log2 max(n, d))	59.3403
Wilson height (sopfr(nd))	130
Harmonic entropy (Shannon, [math]\sqrt{nd}[/math])	~4.03446 bits
Comma size	small
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The blackjackisma (monzo: [-10 7 8 -7⟩, ratio: 854296875/843308032) is a small 7-limit comma. It is the amount by which a stack of seven 15/14's exceeds the classical minor sixth (8/5).

Temperaments

Tempering out this comma in the 7-limit results in the rank-3 blackjackismic temperament.

Etymology

This comma was named by Gene Ward Smith in 2011 for the fact that the Blackjack scale contains a pump for this comma.