
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
Let  $S$  be the set of natural numbers that cannot be written as the sum of three squares. Legendre's three-square theorem states that  $S$  consists of precisely the integers of the form  $4^a(8b+7)$  where  $a$  and  $b$  are nonnegative integers. Find the smallest  $n\in\mathbb N$  such that  $n$  and  $n+1$  are both in  $S$ .

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