5-9-13-15 by 5/4 bihexany

A 15-odd-limit bihexany. This creates a scale of 1 25/24 13/12 5/4 13/10 65/48 13/9 3/2 13/8 5/3 65/36 15/8 2/1, with steps of 25/24 26/25 15/13 26/25 25/24 16/15 27/26 13/12 40/39 13/12 27/26 16/15. As the base hexany has 3/2's and 6/5's in it, but no 5/4's, this is the obvious choice to expand it out into a bihexany without repeating any notes, giving you 6 notes with perfect fifths above them, all of which have 5-limit major and/or minor thirds as well, and it proves to be a quite melodically effective one as well, with only one mildly dubious fith-tone and a large semiquartal gap on the opposite side.

Circle diagram.

! 5-9-13-15_by_5/4_Bihexany.scl
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5 9 13 15 by 5/4 2-combination Bihexany
12
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70.672
138.572
386.313
454.213
524.886
636.617
701.955
840.527
884.358
1022.931
1088.268
1200