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A195526
Numbers written with two Roman numerals.
1
2, 4, 6, 9, 11, 15, 20, 40, 51, 55, 60, 90, 101, 105, 110, 150, 200, 400, 501, 505, 510, 550, 600, 900, 1001, 1005, 1010, 1050, 1100, 1500, 2000
OFFSET
1,1
COMMENTS
The second group of numbers in A003587.
EXAMPLE
2=II. 4=IV. 6=VI. 9=IX. 11=XI. 15=XV.
CROSSREFS
Sequence in context: A377057 A303331 A233776 * A153196 A247185 A237685
KEYWORD
nonn,base,fini,full,easy,less
AUTHOR
Kausthub Gudipati, Sep 20 2011
STATUS
approved