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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)
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