# Arithmetic
Reset after 
$$r' = r + c$$
# Geometric
Reset after 
$$r' = r * q$$
# LUBY / Reluctant Doubling

```
// Where v is the actually intereting part
(u,v) = (1,1)
(u', v') = (u & -u == v ? (u + 1, 1) : (u + 2v))
//Doubles every so often
/ Series: 1 1 2 1 1 2 4 1 1 2 4 8 ...
```