What would be the next in the sequence of 1, 3, 6, 11, 18 and 29?

Answer 1

1 + 1st prime = 1+ 2 = 3
3 + 2nd prime = 3 + 3 = 6......
29 + 6th prime = 29 + 13 = 42.

Answer 2

42

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Adding prime numbers in sequence:
1
1+2=3
3+3=6
6+5=11
11+7=18
18+11=29
29+13=42