This is a 3 part pattern in C major.
The first section is one of the earliest patterns I can remember coming up with on the ukulele - it is a simple C to F, but with a modified voicing for the F chord.
The other two sections continue to evolve over time - every few months they change slightly, or sometimes I swap one out for a different pattern. This is how I’m currently playing it.
This pattern was played on my Kala tenor ukulele.