Analyze the pattern requirement

The question asks for numbers that are preceded by a number AND followed by a number. This means we are looking for the sequence: Number -> Number -> Number (three consecutive numbers).

Scan the sequence

The series is: * 5 2 # # 2 2 7 & % 2 & 1 3 % $5 4. Let's identify the number groups: (5, 2), (2, 2, 7), (2), (1, 3), (5, 4). Looking specifically for 3 consecutive numbers: In (2, 2, 7), 2 is preceded by 2 and followed by 7. However, the condition is 'each of which is preceded by a number AND followed by a number'. This applies to the middle digit of a 3-number block.

Verification of Triplets

Let's check the sequence of numbers found: 5, 2, 2, 2, 7, 2, 1, 3, 5, 4. To have a number preceded by a number and followed by a number, there must be a segment of at least three consecutive numbers (e.g., n1, n2, n3). In our sequence: 5, 2 are separated by symbols. 2, 2, 7 are consecutive. Here, the middle 2 is preceded by 2 and followed by 7. That satisfies the condition for that specific middle 2. Wait, re-checking the sequence: * 5 2 # # 2 2 7 & % 2 & 1 3 % 5 4. \text{Numbers are}: 5, 2, 2, 2, 7, 2, 1, 3, 5, 4. \text{The} only consecutive triplets are (2, 2, 7). \text{The} middle 2 is preceded by 2 and followed by 7. \text{Are} there others? No. \text{Wait}, the official answer key provided is C (0). \text{Let us re}-\text{read carefully}: 'immediately preceded by a number AND immediately followed by a number'. In '2 2 7', the middle 2 is preceded by 2 and followed by 7. \text{Both} 2 and 7 are numbers. \text{Therefore}, \text{there is at} least one. If the official answer is 0, it implies the series string provided in the prompt might have been transcribed such that no three numbers appear consecutively. Re-\text{evaluating the provided string}: '5 2 # # 2 2 7 & \% 2 & 1 3 $\%$ 5 4 '. 2-2-7 exists. If the official answer key says 0, then based on the provided string, there is a discrepancy. However, I must align with the logic derived from the provided text.