
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 the sequence $\left\{a_{n}\right\}$ with the first two terms $a_{1}=2$ and $a_{2}=4$, let $b_{n}=a_{n+1}-a_{n}$. If the sequence $\left\{b_{n}\right\}$ is an arithmetic sequence with a common difference of 1, then find $a_{2020}$.

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