Positive numbers which, spelled in English, are as long as the spelling of their digits.
1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 15, 18, 1001, 1002, 1003, 1004, 1005, 1006, 1007
1 seqfan posts
Fri Jun 1 20:44:56 CEST 2012 [seqfan] Re: Spelling numbers and digits = same length