
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
Given a sequence $\{a_n\}$ with the sum of its first $n$ terms $S_n= \frac {3^{n}-1}{2}$, let $b_n=\log_{9}a_{n+1}$.  
(1) Find the general formula for the sequence $\{b_n\}$.  
(2) If the sum of the first $n$ terms of the sequence $\{b_n\}$ is $T_n$, and the sum of the first $n$ terms of the sequence $\{\frac{1}{T_n}\}$ is $H_n$, find $H_{2017}$.

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