by Catisfluffy » Wed Oct 10, 2018 5:57 pm
I think they exist for at least 1 (trivial), 2 ((pair of 7-simplices) antiprism), 7 (rectified 8-orthoplex army), 8 (demiocteract army), 15 (fy army), and 135 (bay army). Wikipedia mentions the existence of regular compounds of 240 and 480, but I don't understand how those are constructed.