What is known as "father" has a large 3:2 which warps the heptatonic scale to an octatonic.
Analogously, in hyperpyth, 13ed5 has an analogously large "13:5" which warps the scale similarly. I haven't figured out what it approximates well, but it sounds good.
18ed5 also does this; the "13:5" is actually 50 cents sharp, while 8:3 is much closer. Interesting.