45/16
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45/16 |-4 2 1>
1790.2237155956 cents
The 5-limit just major eleventh is the interval 45/16 -- the tritave inverse of the difference between the major third 5/4 and the fourth 4/3, and between 3/2 and 8/5.
When the comma between the tritave and this ratio is taken as a comma to be tempered, it produces father temperament, where 4/3 and 5/4 are equated. In this temperament, major thirds and fifths become octave-inverses of each other.