A 17-odd-limit Hexany. This creates a scale of 1 17/16 17/14 13/8 13/7 221/112 2/1, with steps of 17/16 8/7 91/68 8/7 17/16 224/221. While it does have one fairly stable fifth that is only flat by 273/272, all the intervals are clustered on one side of the scale with a large gap on the other side and many of the steps are highly xenharmonic, making it quite challenging to work with.

Circle diagram.
! 1-7-13-17_Hexany.scl
!
1 7 13 17 2-combination Hexany
6
!
104.955
336.129
840.527
1071.701
1176.657
1200

Suggested keyboard mapping: C Db Eb Ab Bb B C