128.1+1=22+2=44+4= 1616+16= 3232+32= 64 64+64 = 128128+128 = 256256+256 =512512+512= 1024Each time take the answer from the previous problem and double it to find the next number in the sequence.
It all depends on the sequence you are talking about. For example, the next number in the sequence 0,1,1,2,3,5,8,13,_ would be 21. This would be the Fibonacci sequence as the rule is add the 2...