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If you mean: 9, 19, 39, 69 then the next number in the sequence is 109
If you mean GOOGOL, the next number is one googol plus 1.
Do you mean the next number or the sequence equation. And there isn't a solid patter, there's to much ambiguity to determine a logical next number.
If you mean: 1 1 2 3 5 8 13 21 then the next number is 13+21 = 34
There are infinite numbers after 90 but if you mean the next integer then it is 91