Numerical Answer
48 does not belong, because the sequence is (double) then (add 3) and after 256 to 29, the last number should be 58.
Spelling Answer
2 does not belong, because the rest of the numbers include the letter E when you spell them out in English.
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1 - it is the only number that is neither prime nor composite.
The numbers that belong to the series are the following: 1, 2, 5, 10, 13, 26, 29 and 48.
30
7
8