Exam Maths Puzzle Logical Reasoning

2 9 30 105 ? 2195

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Actually i am not remembering qus. exactly but it is look like this--
x is any number system like binary number system 0 and 1 allow, where x represents only 1 and z is the decimal representation of that x, so what is the value of z=?
option 1)-121 2)-11111 c)-both d)-none....reply
0,2,3,5,8,10,15,17,24,26