35.
5+2^1=5+2=7
7+2^2=7+4=11
11+2^3=11+8=19
19+2^4=19+16=35
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67
What would be the next number in this series 15 12 13 10 11 8?
19
If you mean: 2 3 5 7 11 13 and 17 then the next number is 19 because they are all prime numbers
42 is the next number in this sequence. This number sequence is adding the next prime number to the last number. So 1 + 2 = 3. Then 3 + 3 = 6, 6 + 5 = 11, 11 + 7 = 18, 18 + 11 = 29. The next prime number after 11 is 13, so 29 + 13 = 42. The next numbers would be 59 (42+17), 78 (59+19), and 101 (78+23)