Niphanos
Pretty Preening Pegasus
Your description is flawed. You said base four but 0-4 is base five. It would go 0-3, making the count from 1 to 10 be 0, 1, 2, 3, 10, 11, 12, 13, 20, 21, 22.
Yes, only zero to four. The numeric system we humans use has a base count of zero to ten, this is because we have ten fingers. Ponies have four hooves, so logically their numeric system would have a base of five.
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. would be 0, 1, 2, 3, 4, 10, 11, 12, 13, 14, 20.