The next number is 47.
After this series gets going, each number is the sum of the two numbers before it.
If the first two numbers were zero and 1, this would be the Fibonacci series.
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26
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)
47 4+7 = 11 7+11 = 18 11+18=29 18+29=47
It is obvious that 7 is added to get the next number from the previous one.
The number 7 comes next.
24
30!
42 as you have to add the next prime number onto the previous value.
11
6
18
6