Forge comma

Interval information

Ratio	1640558367/163840000
Factorization	2-18 × 314 × 5-4 × 73
Monzo	[-18 14 -4 3⟩
Size in cents	3988.593¢
Names	forge comma, forge
FJS name	[math]\displaystyle{ \text{d25}^{7,7,7}_{5,5,5,5} }[/math]
Tenney height (log2 nd)	57.8993
Weil height (log2 max(n, d))	61.2231
Wilson height (sopfr(nd))	119
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The forge comma, or more simply, the forge, is the 7-limit unnoticeable comma 1640558367/163840000, which measures roughly 2.28 cents. It's notable as the interval separating the amity comma from the gamelisma. This comma was first found as the 7-limit comma linking 12edo, 34edo and 159edo.