My favorite ChatGPT answer about math is: Me: What is the 19th digit of pi ChatGPT: The value of pi is approximately 3.14159265359, and the 19th digit is 5.

My favorite ChatGPT answer about math is: Me: What is the 19th digit of pi ChatGPT: The value of pi is approximately 3.14159265359, and the 19th digit is 5. However, it is important to note that the digits of pi continue infinitely, so this is only an approximation of the 19th digit.