Question

What is the next number?
3,4,6,9,13,18,24=

Answer 1

Hello.

In the sequence above, the next number would be 31.
Observe.

3 + 1 = 4
4 + 2 = 6
6 + 3 = 9
9 + 4 =13
13 + 5 =18
18 + 6 =24
24 + 7 = 31

As you can see the rule is: +1 x 2

Answer 2

The next number is 31.

3 + 1 = 4
4 + 2 = 6
6 + 3 = 9
9 + 4 = 13
13 + 5 = 18
18 + 6 = 24
24 + 7 = 31