This problem was easy to me that make my brain to take a rest.
the steps to solve
1. I had to find range of base that number can cover 10^2
It was sqrt of 10^2 include itself.
2. generater all possible base numbers
ex) in 2 base
11, 111, 1111 ...
3 7 15
3. exclude 2 digit number.
4. put set to real number
5. sum of set
this is my solution.
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