[function_seven]

I always play the (2n+1) game myself. (Or do I??)

[User23]

Better than the 3n+1 game[1]. That one can really get you.

[1] https://www.quantamagazine.org/why-mathematicians-still-cant...

[the_af]

That's what they... er, you... er, somebody wants you to think?

[formerly_proven]

That’s my secret… I never think.

[banku_brougham]

2n for me, probably