Since there are so many math annons here I'm stuck on a silly thing.
What is a function that maps
0 =0
1 =1
2 =2
3 =3
4 =3
5 =2
6 =1
7 =0
8 =1
9 =2
…
And then repeats forever?
Because of reason
Good one, thank you
Stay safe, my friend. I wouldn't travel through Europe now, but you do what you must do.