1-5-11-15 hexany
An 11-limit Hexany. This creates a scale of 1 33/32 11/10 11/8 3/2 15/8 2/1, with steps of 33/32 16/15 5/4 12/11 5/4 16/15. This has two clusters with wide gaps between them, which means it contains no familiar chords despite having both 3/2's and 5/4's within it, but it is relatively easy to fill that gap with a suitable interval to expand it into a bihexany.

! 1-5-11-15_Hexany.scl ! 1 5 11 15 2-combination Hexany 6 ! 33/32 11/10 11/8 3/2 15/8 2/1
Suggested keyboard mapping: C Db D F# G B C