26
As far as I can tell the sequence is +10,-5,+10,-5.
66
17?
18
The most obvious pattern in the sequence 10 30 15 16 48 24 25 is ...*3,/2,+1... The next number in the sequence following the 25 will be 75.
16 is the next squared number.
The next number in the sequence 2, 4, 16, 64 is 256.
a
The next number in the sequence is... 64
65,536 is.
8
It is: 34
If you mean: 1, 2, 4, 8 and 16 then the next number is 32