
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
Consider the sequence  $$ 1,7,8,49,50,56,57,343\ldots $$  which consists of sums of distinct powers of $7$ , that is,  $7^0$ ,  $7^1$ ,  $7^0+7^1$ ,  $7^2$ , $\ldots$  in increasing order. At what position will  $16856$  occur in this sequence?

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