I don't see that 137 has been notated yet; prime EDOs have (with the exception of 73) been notated only up to 89. @Dave Keenan do you have any record of taking a shot at 137, and if so, do you have any notes to share about it?
Of course there are many more universally appealing EDOs to work on so I don't expect to divert attention to 137. I'm motivated to notate it because it does a good job at approximating the pitches in my Yer tuning, as you can see here in the results of Graham Breed's temperament finder. I also think that drafting a proposal for a Sagittal EDO notation will be a good way for me to get a sense for the process as described in the Xenharmonikon article:
137 has 12 steps per apotome and 11 steps per limma, which I think puts it in the grey area of the periodic table. It has a pretty good fifth of 700.729927 cents. Notably 137*18 = 2466 which is remarkably close to the 2460edo which the extreme precision JI notation is based on. Perhaps I can lean on it when choosing my symbols.These have been selected using several criteria, including a symbol’s prime factor limit, the division’s prime number errors and consistency, and validity of secondary comma roles. Consistency of symbol flag arithmetic for the single-shaft symbols has been strictly maintained, but occasional inconsistencies have been allowed for double-shaft apotome complements in cases where they are not likely to be noticed.
Anyway, again, don't spend too much time on this please. I just thought I'd be remiss not to at least ask if anyone had tried their hand at 137 already.