The pattern could involve numbers, letters, or whatever else. It should make sense and be unusual or somewhat difficult... But don't make something ridiculous. There's no fun with figuring out a pattern that has a formula like ((x + 5) ^ (2 * log(5 * x)) - 1000).
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Here's one to start...
- 1, 3, 5, 4
- 2, 3, 5, 4
- 3, 5, 4
- 4
- 5, 4
- 6, 3, 5, 4
- 7, 5, 4
- 8, 5, 4
- 9, 4
- 10, 3, 5, 4
- 11, 6, 3, 5, 4