1
Input: 8 → [?] → 40, what is the rule? =
2
Input: 6 → [?] → 3, what is the rule? =
3
Input: 1 → [?] → 6, what is the rule? =
4
Input: 4 → [?] → 3, what is the rule? =
5
Input: 5 → [?] → 10, what is the rule? =
8
Input: 4 → [?] → 20, what is the rule? =