Roman numerals with "i" replaced by "1", "v" replaced by "5", "x" replaced by 10, etc., sorted in increasing order.
1, 5, 10, 11, 15, 50, 51, 100, 101, 105, 110, 111, 500, 501, 505, 511, 1000, 1001
1 seqfan posts
Mon Jan 25 15:38:16 CET 2010 [seqfan] Incorrect b-files