1
Input: 1 → [?] → 1, what is the rule? =
2
Input: 5 → [+4 ×2] → ? =
3
Input: 4 → [?] → 16, what is the rule? =
4
Input: 1 → [?] → 6, what is the rule? =
5
Input: 7 → [?] → 35, what is the rule? =
7
Input: 9 → [?] → 45, what is the rule? =
8
Input: 5 → [?] → 7, what is the rule? =