Find the one hundredth positive integer that can be written using no digits other than digits 0 and 1 in base 3. Express your answer as a ba

Hey superman!

The goal is to count in base 3 using only binary digits.

The $100^{\text{th}}$ smallest positive binary integer is $100 = 1100100_2,$ 

so the $100^{\text{th}}$ smallest positive integer that can be written with only the binary digits is

 $1100100_3 = \boxed{981}$.

I hope this helped,

Gavin.