These are squares.
12 = 1
22 = 4
32 = 9
(it is missing 42 = 16)
52 = 25
62 = 36
The next one in the series is probably 72 = 49.
81
49 (it is an arithmetic series that adds 5 then 7 then 9 then 11 then 13)
The Pattern is 1^2- 2^2- 3^2- 4^2- 5^2 or 1 - 4 - 9 - 16 - 25 The next number in the series is 6^2 or 36
108
36
81
The next number in the series 4, 12, 6, 12, 36, 18, 36
The next number in the series 4-12-6-12-36-18-36.. is 108.
49 (it is an arithmetic series that adds 5 then 7 then 9 then 11 then 13)
It is: 36 because 6 squared = 36
49, 36, 25...
The Pattern is 1^2- 2^2- 3^2- 4^2- 5^2 or 1 - 4 - 9 - 16 - 25 The next number in the series is 6^2 or 36
108
Yes, 36 is next.
108
108
108