815830271/800000000

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815830271/800000000, the large tridecimal eighth-octave comma, is a comma slightly larger than the syntonic comma that is the difference between eight 13/10's and three octaves. It is tempered out in low EDOs that are a multiple of 8, along with 214990848/214358881 and 17303/17280, defining various 8th-octave temperaments.