84
16+8=24
24+12=36
36+16=52
52+16=68
68+16=84
256 256
625
481
2245
24, they are going up in 3's, 13, 16, 19 and 18, 21 so next number is 24.
This is the series of square numbers, (16= 4*4). The next number is 5*5=25.
256 256
625
481
24
2245
37
26
16*3 = 48
22
It is: 16 squared = 256
Add successive square numbers. The next number is 57.