Find the missing character from among the given alternatives

Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 2031
Going round the small circles from 3 (on the right, through 16 at the bottom), each number is the one before it multiplied by 5, the number in the big circle, plus 1:
\(3\times5+1=16\)
\(16\times5+1=81\)
\(81\times5+1=406\)
\(406\times5+1=2031\), the missing number
