Question

What number comes next 3 4 6 9 13 18 24

Answer 1

31.

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

Answer 2

31 - as the difference (starting from 1) increases by 1

so:

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