Uban number
Encyclopedia : U : UB : UBA : Uban number
Uban numbers are defined as numbers who don't contain the letter 'u' when spelled in English. This definition is not definitive as some large numbers don't follow the guidelines for naming of numbers.
The first uban numbers are: 1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, 25, 26, ...
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