1-(2)3-(5)8-(11)19-(23)42-(?)?
0*2=1 = 1 1*2=2 + 1 = 3
2*2+1 = 5 + preceding number = 8
5*2+1 = 11 + preceding number = 19
11*2+1 = 23 + preceding number = 42
23*2+1 = 47 + preceding number = 89
so I think the answer is 89.
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(1*2)+1=3 (3*2)+2=8 (8*2)+3=19 (19*2)+4=42 (42*2)+5=89 (89*2)+6=184 Basically the number times two and then add the the number it is in the sequence...i.e. 1 is the first number so add one, 3 is the second number so add two, etc.
The next number in the sequence will be 56.
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)
330
42 is a multiple of 3 because 14*3 = 42