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A003587
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Roman numerals with 1 letter, in numerical order; then those with 2 letters, etc.
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5
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1, 5, 10, 50, 100, 500, 1000, 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, 3, 7, 12
(list; graph; refs; listen; history; internal format)
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