1-3-5-11-13-15 eikosany
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A 15-odd-limit eikosany. This creates a scale of 1 65/64 33/32 13/12 11/10 143/128 143/120 39/32 5/4 13/10 11/8 143/96 3/2 13/8 55/32 143/80 11/6 15/8 2/1, with steps of 65/64 66/65 104/99 66/65 65/64 16/15 45/44 40/39 26/25 55/52 13/12 144/143 13/12 55/52 26/25 40/39 45/44 16/15. (11/8 and 13/8 appear twice, reducing it to a 18 note scale) While it does have 8 perfect fifths in it, it also has some quite extreme clustering, with multiple notes an eighth-tone apart or even closer, making it very easy to produce wolf chords if you don't keep careful track of what note is mapped to each key.
! 1-3-5-11-13-15_Eikosany.scl ! 1 3 5 11 13 15 3-combination Eikosany 18 ! 26.841 53.272 138.572 165.004 191.845 303.576 342.482 386.313 454.213 551.317 689.890 701.955 840.527 937.631 1005.531 1049.362 1088.268 1200