49 (it is an arithmetic series that adds 5 then 7 then 9 then 11 then 13)
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This is the series of square numbers, (16= 4*4). The next number is 5*5=25.
33
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
The next number is 25 but there are the sequence is infinite so there can be no end to the sequence.
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.