47
4+7 = 11
7+11 = 18
11+18=29
18+29=47
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It is obvious that 7 is added to get the next number from the previous one.
The nest number in the sequence is 18. Note that the difference between each number and the next number in the sequence follows the simple sequence of 1,2,3,4. Obviously the next in the sequence of increases is 5, so 13+5=18.
35. The difference between successive terms increases by 1: 5 + 6 = 11 11 + 7 = 18 18 + 8 = 26 ⇒ 26 + 9 = 35
If you mean: 7 18 29 40 then the next term is 40+11 = 51
The next number in the sequence would be 25.