
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
If the sum of the digits of a positive integer $a$ equals 6, then $a$ is called a "good number" (for example, 6, 24, 2013 are all "good numbers"). List all "good numbers" in ascending order as $a_1$, $a_2$, $a_3$, …, if $a_n = 2013$, then find the value of $n$.

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