18
3
4 (3+1)
6 (4+2)
9 (6+3)
13 (9+4)
18 (13+5)
...and so on
31
18 3 +1 4 +2 6 +3 9 +4 13 +5 18 +6 24 +7 31 +8 39 +9 48 +10 58...
35
The next number in the sequence is 18. It's +1, +2, +3, +4, ....
3. It is the number of letters in the names of positive integers in English.
18
18. 3+1=4, 4+2=6, 6+3=9, 9+4=13, 13+5=18.
31
The pattern alternates between two sequences: one decreasing by 1 (18, 13) and the other decreasing by 2 (4, 6). Following this pattern, the next number after 6 should be 3 (6 - 3), and the next number after 13 should be 12 (13 - 1). Thus, the next two numbers in the sequence are 12 and 3.
14
18 3 +1 4 +2 6 +3 9 +4 13 +5 18 +6 24 +7 31 +8 39 +9 48 +10 58...
24 + 1 + 3 + 6 then repeat so 23 + 1 = 24
11 comes next.
16.
22
35
37, it is 4+1 from the first number and 4+2 from the second number then 4+3 from third so on....