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A195526 Numbers written with two Roman numerals. 1


%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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Last modified January 17 18:02 EST 2020. Contains 330987 sequences. (Running on oeis4.)