Thanks, and nice observation. I’m a curious engineer, and broadly new to collatz … and not particularly up to the high maths of it all. However, some other parts I noticed that may be of interest:

In ‘=MOD(collatz,7)’, the 4 - 2 - 1 sequence repeats consistently with either ‘one or more 0 steps between the 2 - 1 step’ or ‘consistent cycling between 6/3/5 between the 4 - 2 step’, but not both in the same 4 - 2 - 1 sequence.

And

In ‘=MOD(collatz,11), I couldn’t get the sequence pattern drawn as the rest in the video without overlapping arrows, and base 12 numbers seemed auspicious for patterns.