Only a few that I can think of: I, V, X, XV, XX, XL, L, LV, LX, and M.
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2,4,
26 and 31
40,8,20,25,35,30,14,9,19,17,22,32,
Roman numerals were made just for the same reason as Arabic numerals we are using now.Romans needed some characters to record quantities, dates, taxes etc.So they invented their own system. Bear in mind that roman numerals are older than Arabic ones.
3