There are no letters in that sequence. The progression of numbers can be
extended according to the rule shown by appending '26' as the fifth term.
The next number in the sequence 2, 4, 16, 64 is 256.
a
16
16 is the next squared number.
16 21 22 29
2and1
65,536 is.
8
It is: 34
7 10 16 28
The answer is: 1,4,9,16,25,36 and so on.
81