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%I #8 Mar 31 2012 10:28:38
%S 2,4,6,9,11,15,20,40,51,55,60,90,101,105,110,150,200,400,501,505,510,
%T 550,600,900,1001,1005,1010,1050,1100,1500,2000
%N Numbers written with two Roman numerals.
%C The second group of numbers in A003587.
%e 2=II. 4=IV. 6=VI. 9=IX. 11=XI. 15=XV.
%K nonn,base,fini,full,easy,less
%O 1,1
%A _Kausthub Gudipati_, Sep 20 2011
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