1-3-5-7 by 8/7 bihexany

Circle diagram.

Circle diagram. (rotated)

Two copies of the simplest possible Hexany, offset by a harmonic seventh. This creates a scale of 1 8/7 7/6 5/4 4/3 10/7 35/24 5/3 7/4 40/21 2/1, with steps of 8/7 49/48 15/14 16/15 15/14 49/48 8/7 21/20 160/147 21/20. This only slightly reduces the size of the largest steps and has two duplicated notes, making it not particularly optimal as bihexanies go, but it still has four notes with perfect fifths above them and a decent number of simple chords available, making it not too hard to compose with once you get used to its quirks.

! 1-3-5-7_by_8/7_Bihexany.scl
!
1 3 5 7 1-3-combination Hexany
10
!
231.174
266.871
386.313
498.044
617.487
653.184
884.358
968.825
1115.532
1200

Suggested keyboard mapping: F F# G A Bb B C D D# E F