It is 29, again.
The position to value rule is:
Un = (-11n6 + 273n5 - 2675n4 + 13215n3 - 34034n2 + 43392n - 19440)/720 for n = 1, 2, 3, ...
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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)
42 as you have to add the next prime number onto the previous value.
47, you add the two previous numbers together: 3+4=7 4+7=11 7+11=18 18+29=47.
It is: 47 because 18+29 = 47
1, 3, 4, 7, 11, 18, 29, 47