These series follow a pattern.
2 4 8
1 17 476
65 20987 3571890
This series does not follow the pattern
18 79 45
What is the pattern?
The numbers must be in ascending order. This can be a fun one to have people work out in person, as they test out three-number series and you can tell them whether or not they satisfy the pattern.
Thanks to Patrick for sending this in and thanks to this video from Veritasium for inspiring Patrick.