General Studies · Number Series

Refer to the given series and answer the question that follows (all numbers are single-digit numbers only, and all counting is to be done from left to right): (Left) 2 2 4 8 2 4 6 4 2 6 8 8 6 7 4 5 3 6 2 8 7 1 3 3 6 8 6 4 (Right) How many such odd digits are there, each of which is immediately preceded by a perfect square and immediately followed by an even digit? (Note: 1 is to be considered a perfect square.)