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%N Numbers that are pandigital in Roman numerals using each of the symbols I, V, X, L, C, D and M exactly once.
%C Subset of A105417.
%e a(1) = 1444 because written in Roman numeral it is MCDXLIV, using each of the symbols I, V, X, L, C, D and M exactly once.
%A Robert Happelberg (roberthappelberg(AT)yahoo.com), Apr 06 2005