492128/492075
492128/492075, the catiton, is an unnoticeable 13-limit (specifically 2.3.5.7.13-subgroup) comma measuring 0.186 ¢. As an ultraparticular, tempering it out splits the 28/25 meantone into three 27/26 third-tones, the 96/91 semitone into two 416/405 quartertones, and equates the superparticular ratios 729/728 and 676/675. It times the catasma is the ragisma, visible in its S-expression as (S25/S26)(S26/27) = S25/27 = 4375/4374.
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Temperaments
It is tempered out in bischismic, buzzard, catakleismic, godzilla, harry, hemiseven, iron, mirkat, ennealimmapine, sruti, unicorn, and unthirds temperaments.