
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
For each positive integer \( x \), let \( f(x) \) denote the greatest power of 3 that divides \( x \). For example, \( f(9) = 9 \) and \( f(18) = 9 \). For each positive integer \( n \), let \( T_n = \sum_{k=1}^{3^n} f(3k) \). Find the greatest integer \( n \) less than 1000 such that \( T_n \) is a perfect square.

Present the answer in LaTex format: \boxed{Your answer}
user