Blackjackisma
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Ratio
854296875/843308032
Factorization
2-10 × 37 × 58 × 7-7
Monzo
[-10 7 8 -7⟩
Size in cents
22.41337¢
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
open this interval in xen-calc
Interval information |
(Shannon, [math]\sqrt{nd}[/math])
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[1].