1
10
10
220
10
5
10 before 241 = 231
The number that comes next in the series 1 2 2 5 3 10 is 7. You get this number by subtracting the number 3 from the number 10.
9,999
10 if you are counting whole numbers.
11 comes next.
In base-10, 10099 + 1 = 10100