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%I #12 Sep 08 2018 17:10:09
%S 3,4,6,9,11,51,90,102,105,110,150,201,300,400,501,600
%N Numbers that require three strokes when written in Roman numerals (excluding serifs). III IV VI IX XI LI XC CII CV CX CL.
%C Unlike the case in A002963, C is counted as one stroke and D is counted as two strokes here. This sequence is complete up to 3999, though it may contain some more terms such as 5000 depending on the convention used to represent larger numbers. - _Nathaniel Johnston_, May 18 2011
%F Numbers that require three strokes when written in Roman numerals (excluding serifs).
%K nonn,easy,fini,full,base
%O 1,1
%A Dylan Nicholson (wizofaus(AT)hotmail.com), May 11 2006
%E a(12)-a(16) from _Nathaniel Johnston_, May 18 2011