Complete this sequence (the 95% fail):
2 3 4 9 16 81 256 ?
6561
There are two sequences arranged alternately. In each sequence the number is the square of the previous number in that sequence. 561 is the square of 81.
6561
There are two sequences arranged alternately. In each sequence the number is the square of the previous number in that sequence. 561 is the square of 81.