
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
Ancient Greek mathematicians called the numbers 1, 3, 6, 10, 15, 21, ... triangular numbers. Please study the pattern and calculate the difference between the 23rd triangular number and the 21st triangular number.

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