I don't know the background but GMP has a very efficient algorithm to calculate the factorial, you maybe can take a look on it's sources.

For example it give an immediate exact result of 10000! ( ~= 2,84E35659 )

Hi,
see Documentation/3.audio.examples/I01.Fourier.analysis.pd
and Documentation/3.audio.examples/I02.Hann.window.pd

@jameslo said:

I think I'd have to also add some padding to the end to meet some message length requirement.

Yes I don't read the doc but I think the message should be a 8 bytes words multiple and ends with 44 0 0 0. So you need to add as many zero as required before this.

Hi,
if the 92 backslash is added by oscformat let's try to don't use it

32 is space
47 is slash
I deduce the required end of the message from oscformat output

Hi,
Take a look at the [text] object.

Hi,
Take a look at https://git.purrdata.net/jwilkes/purr-data/-/tree/emscripten/emscripten/project/purr-data
and https://purrdata.glitch.me/

Hi,
considers using [makefilename]. And you can skip [select].

If you don't care of heaviness and dependencies, you very can use QT.
See https://doc.qt.io/qt-5/qtimer.html

@Obineg said:

90% of the humans are not even able to give answers which sound correct.

Either you include yourself in these 90% and this sentence doesn't sound correct or you have excessive pride.

ChatGPT is nothing but a tool. As for all tools I have to try it before I can decide its usefulness.

As I understand ChatGPT is based on a generation which choose one word after another, it doesn't have the answer to our question until it writes it down.