16
5
If you mean: 1 4 9 16 25 then it is 36
It is: 6 squared = 36
25, 36, 49, 64, 81, 100...
This appears to be two interwoven sequences. The first sequence, increases by 9 then 19......7 + 9 = 16........8 + 19 = 27 The second sequence decreases by 8 then 18....16 - 8 = 8........27 - 9 = 18 The next number would thus be 9 + 29 = 38.
182.25. 16 is square of 4, 36 is a square of 6, 81 is a square of 9. So the next term will be a squre.24=46, 54=69, therefore 121.5=9*x, then you will get x=13.5 and square of 13.5= 182.25 thats all
81
81
Please note that (a) this is a sequence of square numbes, and (b) the sequence starts at 22.
. 16
-64