A 17-odd-limit Hexany. This creates a scale of 1 17/16 11/10 187/160 11/8 17/10 2/1, with steps of 17/16 88/85 17/16 20/17 68/55 20/17. With no perfect fifths and many large, xenharmonic steps, this is essentially a diminished tetrad with a couple of smaller notes filling in one of the quadrants, making it quite unstable and challenging to work with.

Circle diagram.
! 1-5-11-17_Hexany.scl
!
1 5 11 17 2-combination Hexany
6
!
104.955
165.004
269.959
551.317
918.641
1200

Suggested keyboard mapping: C Db D Eb F# A C