
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 $\{a_n\}$ satisfying $a_1=1$, $a_n=\log_n(n+1)$ $(n\geqslant 2,n\in \mathbb{N}^*)$, define: $k$ $(k\in \mathbb{N}^*)$ that makes the product $a_1\cdot a_2\cdot \cdots \cdot a_k$ an integer as "simple number". Then, the sum of all "simple numbers" within the interval $[3,2013]$ is.

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