
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
(1) The numbers we commonly use are decimal numbers, such as $2639 = 2 \times 10^3 + 6 \times 10^2 + 3 \times 10 + 9$. To represent decimal numbers, we use 10 digits: 0, 1, 2, 3, …, 9. In electronic computers, binary is used, which only requires two digits: 0 and 1. For example, in binary, $101 = 1 \times 2^2 + 0 \times 2^1 + 1$ equals the decimal number 5. Then, what is the decimal equivalent of the binary number $1101$?  
(2) Exploring the "number black hole": The term "black hole" originally refers to a very strange celestial body, which is small in volume, high in density, and has strong gravitational pull, making it impossible for any object to "climb" out once it gets close. Similarly, there is a "black hole" phenomenon in numbers. All numbers that meet certain conditions, through a specific operation, can be sucked into it, with none able to escape its grasp. For example: Take any multiple of 3, cube each digit of this number, and then add them together to get a new number. Repeat this operation of cubing each digit and summing them up. Eventually, you will get a fixed number $T = \boxed{\text{ }}$, which we call the "number black hole".

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